Support for the protocol and Function Call can be used to remotely control home devices. The dual-microphone array supports local voice detection and localization. Equipped with the ESP-Brookesis framework, it handles overall I/O construction and rendering. Power: for EchoEar supports three power options: USB Type-C, lithium battery, and magnetic connector. The 700mAh battery provides ample battery life. The main power source is 5V via USB. The auxiliary power source is 3.7V via the battery. When powered externally, the device simultaneously charges the battery. The red light on the back illuminates during charging and turns green when fully . A power switch on the bottom of the for EchoEar toggles the device on and off, regardless of the power source. Color: White Material: plastic Package Contents: 1 x Shell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.