1. GSM frequency compatibility: three frequency bands (850MHz, 900MHz, 1800MHz, 1900MHz)
2. Microphone range: 5-7 meters radius
3. Power supply: built-in 300 mAh rechargeable lithium-ion battery
4. Turn on the voice control function, and the expected continuous working time is 5-8 days
5. Positioning only functionality is expected to last for 16-21 days
6. When it detects sound, it will call your mobile phone
7. The built-in microphone has a working radius of up to 7 meters, so no matter where you want to set it up
8. Allow audio devices to call you when they hear people talking
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