Alkaline batteries are within the correct specifications and will technically work. However, the WiFi version powers WiFi connectivity, AI communication, the camera module, and image processing; it consumes significantly more power than a simple calculator or remote control. Under higher load, alkaline batteries tend to drain quickly and experience faster voltage drops, which may result in short runtime or unstable performance. And Alkaline Batteries naturally lose charge over time, even before first use. We strongly recommend using high-capacity 1.5V lithium rechargeable AAA batteries, ideally 1200mWh or higher. Higher capacity batteries provide more stable voltage output, longer runtime, and better overall performance. Such as XTAR AAA Lithium Rechargeable Battery Triple AAA Batteries Rechargeable 1.5V 1620mWh

WiFi Version: 2 x AAA batteries; Battery life: depends primarily on the type and quality of the AAA batteries used. Since this model runs on standard AAA batteries, actual usage time varies based on: • Battery brand and capacity • Whether they are alkaline, rechargeable NiMH, or lithium-based • WiFi usage frequency • Screen brightness and usage intensity We do not specify a fixed runtime because performance is directly determined by the batteries installed. 💡If regular alkaline batteries do not provide sufficient runtime, we recommend using higher-quality rechargeable lithium AAA batteries (1.5V). Choosing batteries with a larger mWh (1200+ mWh) will generally provide longer runtime and more stable performance. such as: XTAR AAA Lithium Rechargeable Battery Triple AAA Batteries Rechargeable 1.5V 1620mWh ⚠️ Important: Do NOT use 3.7V lithium-ion AAA batteries. 3.7V batteries exceed the device’s supported voltage range and may cause permanent damage to the calculator. WiFi +4G Version • Charging: Type-C charging port (5V1A) • Battery life: Regular calculator mode: up to 16.5 hours continuous use （WiFi mode: up to 5 continuous hours; 4G mode: up to 10 continuous hours） https://static.wixstatic.com/media/74a8a2_ecbbe41e0fbc4f61bc2da8a5ec6a235d~mv2.png

If your device shuts down immediately after startup, the screen flickers, or the system behaves inconsistently, the most common cause is insufficient or unstable battery voltage under load. Such issues commonly occur when: • Using standard alkaline (dry) batteries • Using low-capacity batteries • Using older batteries that have lost charge during storage When the battery cannot maintain stable voltage under load, the device may shut down automatically or display instability (such as screen flickering). For best performance, we recommend using high-capacity 1.5V rechargeable AAA batteries (preferably 1200mAh or higher) for stable and reliable operation. Such as XTAR AAA Lithium Rechargeable Battery Triple AAA Batteries Rechargeable 1.5V 1620mWh

Both the Wi-Fi version and the Wi-Fi + 4G version run the same system and AI features. The differences are in network connectivity, power design, and battery life. Key differences between the two versions: • Wi-Fi version Uses 2 × AAA batteries (user-replaceable) and supports Wi-Fi only. It is more discreet and suitable for short sessions or situations where replaceable batteries are preferred. • Wi-Fi + 4G version Uses a built-in battery and supports both Wi-Fi and 4G LTE (nano SIM). It offers more flexible connectivity and longer battery life when using 4G. Battery life may vary depending on the network mode (for the Wi-Fi + 4G version) or the type of AAA batteries used (for the Wi-Fi version)： • Calculator mode (no network): up to 16.5 hours on both versions • Wi-Fi mode: up to 5 hours of continuous use • 4G mode: up to 10 hours of continuous use For full hardware details, please refer to our Tech Specs (https://www.7-cal.com//s/f/🔋what-is-the-battery)page.

Yes. After-sales support is available via our support email (support@7-cal.com)(mailto:support@7-cal.com). For faster and more convenient support, we welcome you to join our official Discord (discord.gg/yr6M7cwy3d)community. The product comes with a 1-year warranty. For more details, Please refer to our return-refund-warranty-policy.(https://www.7-cal.com/return-refund-warranty-policy)

The system language of the device is English. However, the AI responses support the following languages and symbols, which cover most use cases. If the language you need is not listed, please contact us - Languages： Albanian, Arabic, Bengali, Chinese (Simplified, Traditional), Croatian, Cyrillic (Russian, Bulgarian, Serbian, Ukrainian, Belarusian, Macedonian, Mongolian), Czech, Danish, Devanagari (Hindi, Sanskrit, Marathi, Nepali), Dutch, English, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Latvian, Lithuanian, Maltese, Malayalam, Norwegian, Polish, Portuguese, Romanian, Slovak, Slovene, Spanish, Swedish, Tibetan, Turkish, Ukrainian, Urdu, Vietnamese, Welsh - Symbols： Ancient Scripts, Animals, Emoji, Emoticons, Games and Entertainment, Geometric Shapes, Mathematical Symbols, Weather 💡Language Setting tips: If you want the AI to reply in only one specific language, you can set this in your Custom Prompt: 'Please reply in .... only.'