Order Policies & Terms

Nohli calculators are custom built electronic devices assembled in small quantities using preowned calculators and additional electronic components. They are not new, factory sealed, or mass produced retail products.

Texas Instruments has discontinued the TI-84 Plus, so Nohli units come from a rotating pool of restored stock. Keypad print color, shell finish, and minor cosmetic markings may vary between batches and cannot be selected.

We make every effort to clean each calculator as thoroughly as possible before shipping. Cleaning does not remove every sign of prior use or restore a used calculator to new retail condition. Please expect a used calculator with visible wear, not a pristine, like-new, or factory-fresh product.

Nohli is not affiliated with, endorsed by, sponsored by, or officially associated with Texas Instruments, TI-84, OpenAI, or any other third-party brand referenced on this website. Third-party brand names are used only for identification and reference.

Because the original calculators are used, units may show normal cosmetic wear, including scratches, marks, discoloration, or other signs of previous use. A unit may occasionally have a small screen or pixel imperfection that does not interfere with normal operation. Cosmetic wear that does not affect functionality is not considered a defect.

Each calculator requires significant time and labor to assemble, configure, and test. Every unit is individually tested before shipping.

Nohli calculators use custom hardware, custom software, WiFi connectivity, and remote AI processing. This technology is experimental and may not perform exactly the same in every situation.

Response quality, accuracy, processing time, connectivity, and battery life may vary. The Nohli 5MP Camera Calculator includes WENJOOP NiMH AAA batteries and a compatible charger. Charge all four batteries together as a matched set for approximately 3–4 hours before use, following the charger's instructions and full-charge indicator. Start with a fully charged set for the best available runtime; charging time alone does not guarantee a full charge or a particular battery life. Occasional troubleshooting, repeated attempts, software reconfiguration, or assistance from support may be required.

These devices should not be treated as traditional mass produced consumer electronics that are guaranteed to operate identically under every condition.

ASK GPT accepts typed questions, and TAKE IMAGE captures a question on paper. OpenAI generates the response; the ESP32-S3 chip typesets supported math notation into image pages for the calculator's graph screen. The calculator itself does not run the AI or typeset the answer.

You can add up to 3 replies per question using text, photos, or both, with previous context carried forward. There is no saved answer history after you leave an answer. Capture one question per photo; photographing another screen is not supported.

AI generated responses are not guaranteed to be completely accurate. Performance may vary depending on the subject, problem difficulty, image quality, lighting, camera positioning, WiFi stability, remote AI availability, and how clearly the question is entered or photographed.

Incorrect answers, incomplete explanations, slower responses, or the need to submit a question again are not automatically considered product defects. Buyers should independently verify important answers.

Allow 2 weeks for assembly, configuration, testing, and fulfillment before shipping.

Shipping time begins only after the order has been completed and transferred to the carrier. Choosing a faster shipping service does not shorten fulfillment.

Requests for faster fulfillment do not guarantee that an order will be completed sooner.

Delivery dates displayed during checkout are estimates and are not guaranteed. Nohli is not responsible for delays caused by the shipping carrier, weather, customs, incorrect addresses, or other circumstances outside of our control.

The buyer is responsible for entering a complete and accurate shipping address. Nohli reserves the right to cancel an order before dispatch if the shipping address appears incorrect, incomplete, or cannot be verified as a real delivery address. We do not accept address changes after an order is placed. If required details are missing, including an apartment or unit number, we will cancel the order, issue a refund to the original payment method, and email you after cancellation. You can then place a new order with the correct, complete address.

Customers must use their real name, a real email address, a reachable phone number, and a complete address at checkout, including apartment, suite, unit, floor, building, or access details when applicable. Orders using fake names, fake contact information, unreachable phone numbers, or incomplete address details may be canceled before fulfillment at Nohli's discretion.

ASK GPT and TAKE IMAGE require internet access through a compatible 2.4 GHz hotspot or Wi-Fi network. The Nohli 5MP Camera Calculator does not support 5 GHz networks or networks that require a browser sign-in page.

On an iPhone, enable Maximize Compatibility for the hotspot. Other phones must provide a compatible 2.4 GHz hotspot with internet access. CHAT works without internet but switches Wi-Fi off; reconnect through SETTINGS before using AI features again.

The buyer is responsible for having access to a compatible WiFi connection or phone hotspot. Inability to connect to a restricted, unsupported, or unreliable network is not considered a product defect.

The Nohli 5MP Camera Calculator uses 4 rechargeable NiMH AAA cells. WENJOOP batteries and a compatible charger are included. Charge all four batteries together as a matched set for approximately 3–4 hours before use. Follow the charger's instructions and full-charge indicator rather than relying on elapsed time alone.

Use only WENJOOP rechargeable NiMH AAA batteries with the supplied compatible charger. Every package includes one matched set of WENJOOP batteries and a charger. The shipping email includes a link to buy additional WENJOOP batteries. Follow the supplied charger instructions and battery-care guidance in the PDF booklet. Older orders remain subject to the items included with the original purchase.

Rechargeable AAA NiMH batteries must be charged with a compatible charger and used together as a matched set. Do not top up one battery by itself, mix freshly charged batteries with partly drained batteries, or combine old and new batteries in the same device. In a series battery pack, the device is limited by the weakest cell. If one cell drains before the others, it may be damaged further and cause sharply reduced runtime.

If a battery set begins lasting much less than expected, check the charging and seating instructions and contact support if the issue continues. Worn cells should be replaced together as a matched set. Charging restores charge, not lost capacity. NiMH voltage is a poor indicator of remaining charge; do not use a voltage reading alone to judge whether the set is ready.

Do not use incompatible batteries or chargers. Damage or malfunctions caused by incompatible voltage, leaking batteries, incorrect installation, improper charging, missing or incompatible chargers, or unsupported battery types are considered user caused damage and are not covered by the defect resolution policy.

Remove one battery when the calculator is not being used to fully disconnect power.

Battery life is approximately 1.5 hours on a full charge for the Nohli 5MP Camera Calculator. Actual runtime varies with cell condition and use; this is an estimate, not a guaranteed duration. Reduced runtime should be assessed through troubleshooting rather than assumed to be a hardware defect or customer error.

Purchases of the Nohli 5MP Camera Calculator include $5 of prepaid OpenAI API usage. After that credit is used, the buyer must create and fund their own OpenAI API key and enter it through the setup portal. Nohli does not charge a recurring subscription or provide unlimited free API usage.

The included $5 of prepaid API usage is expected to last about a month with regular, ongoing study use. This is an estimate, not a guaranteed duration; heavier or excessive use will use the credit sooner. There is no remaining-balance or usage-progress display for the included credit. When it is exhausted, the calculator will show an API error indicating insufficient funds. You can switch to your own funded OpenAI API key at any time through the setup portal. The PDF booklet explains how.

ChatGPT Plus and Pro subscriptions do not cover API usage. If the API account has no available credit or access to the required model, AI requests may fail. Current AI responses are generated by OpenAI's GPT-6 Astra.

The hotspot details and API key are separate settings. Follow the supplied setup booklet. Do not include an API key in a support message or lend the calculator with your own API key loaded.

The setup instructions are provided as a PDF booklet, sent by email with your tracking information when your order ships. There is no setup video. Enter a real email address at checkout and check your inbox, spam folder, and messages from Nohli. The booklet covers the included WENJOOP batteries and charger, charging the cells together, connecting a compatible hotspot, using the device, and adding your own funded API key. The email also includes a link to buy additional WENJOOP batteries.

The setup portal lets you change hotspot details, the API key, and a custom prompt. A custom prompt changes answer style and length, not the built-in math notation rules. The portal shows when it is active; leave the field blank and save to restore the default prompt. The buyer is responsible for following the setup steps carefully.

The buyer must read the entire PDF booklet carefully before using the device or requesting technical support.

The buyer is responsible for charging and installing the required WENJOOP NiMH AAA batteries correctly, using a compatible charger, connecting to a supported hotspot or Wi-Fi network, entering correct connection details, creating and funding their own OpenAI API key after the included credit is used, following the provided booklet, and avoiding unsupported changes. WENJOOP batteries and a charger are included with purchases.

Most setup problems can be resolved by carefully following the booklet and cooperating with support.

Opening, rewiring, reprogramming, modifying, disassembling, or attempting to repair the device without written authorization may make the device ineligible for a return, replacement, or refund when the modification caused or contributed to the problem.

This does not limit any rights that cannot legally be waived.

Nohli does not provide, license, sell, disclose, or distribute its source code, firmware source, private API keys, internal configuration files, build files, or proprietary setup materials.

Software updates, troubleshooting, and repair support are handled only through official support channels at Nohli's discretion. Firmware servicing requires physical reflashing; it is not a remote or customer-installed update. Contact support before sending a device for review under the Returns & Repairs policy. Requests for code access, custom firmware files, private keys, or internal project files will be declined.

Unsupported software changes, deleted files, altered settings, or attempts to reverse engineer or modify the device may make the device ineligible for support, return, replacement, or refund consideration to the extent permitted by law.

Official support is provided through support@nohli.com or a ticket on Discord.

Customers must contact support using the same email address entered during checkout and include the date of purchase, product, full name listed on the order, shipping address, and a clear description of the issue.

Support is available only to the original purchaser and verified owner named on the order. Before support is offered, Nohli may require order proof, owner proof, the checkout email address, the full name on the order, or other reasonable verification details.

A customer may not transfer support access to a friend, classmate, family member, buyer, or other third party by lending, giving away, reselling, or otherwise transferring the device. If an original purchaser gives or sells the product to another person, the original purchaser is responsible for giving that person access to the booklet and setup materials. Nohli may refuse support to anyone who cannot be verified as the original purchaser.

Tickets on Discord are for technical support only. You can request a voice call for troubleshooting, and we will coordinate a time with you. Returns, refunds, repairs, privacy requests, and legal matters must be emailed to support@nohli.com. Do not post order details in a public community channel.

Please allow 24–48 hours for each reply, including replies within an ongoing email or ticket thread. A quick response does not change this window or guarantee immediate replies; email and tickets are not live chat. Nohli will make a reasonable effort to assist customers and resolve legitimate technical issues.

Customers must provide a real full name, a real email address, a real reachable phone number, and a complete shipping address when placing an order. Apartment, suite, unit, floor, building, or access details must be included when applicable.

If Nohli believes the name, email address, phone number, or address provided at checkout is fake, inaccurate, incomplete, or unusable, or if Nohli needs to contact the customer about the product or order and cannot reasonably reach them using the information provided, the order may be canceled.

This requirement helps prevent fulfillment problems, support delays, delivery issues, and orders placed with false or unreachable contact information.

Before purchasing, buyers are responsible for reviewing the complete product description, device limitations, battery requirements, WiFi requirements, product condition, fulfillment estimate, Shipping Policy, and Returns & Repairs page.

Buyers should contact support@nohli.com before purchasing if they are uncertain about compatibility, functionality, or setup requirements. For order-specific questions after purchase, include the date of purchase, product, full name on the order, shipping address, and checkout email.

Nohli is not responsible for misuse of the device or for use that violates school rules, testing policies, institutional guidelines, or local regulations.

Any unauthorized use during an exam or assessment is solely the responsibility of the user.

Questions about compatibility, functionality, battery requirements, setup, or these policies should be sent to support@nohli.com before purchasing. For order-specific support after purchase, include the date of purchase, product, full name on the order, shipping address, and checkout email.

By completing a purchase, the buyer confirms that the Nohli 5MP Camera Calculator is custom built using a preowned device, is not factory new or mass produced, may show cosmetic wear, requires buyer setup and compatible connectivity for AI features, and may produce varying AI results. Purchases include WENJOOP NiMH AAA batteries, a compatible charger, and $5 of prepaid API usage; the buyer must use their own funded OpenAI API key after that credit is used.

The buyer also agrees to review the separate Shipping Policy and Returns & Repairs page for shipping, return, refund, replacement, inspection, and repair terms.