· Regular calculator mode: up to 16.5 hours continuous use （WiFi mode: up to 5 continuous hours; 4G mode: up to 7 continuous hours）

· Charging: Type-C charging port

Yes. After-sales support is available via our support email (support@7-cal.com). The product comes with a 1-year warranty. For more details, Please refer to our return-refund-warranty-policy.

The following languages ​​and symbols are currently supported, which meet most needs. If your language is not available, 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