Bone conduction vibrator produces sound with full and transparent sound quality. 3D surround sound effects transmit music through vibration to improve sleep Use sleep-aiding brain waves to quickly improve your sleepiness White noise soothing sleep-aiding music, sound effects can be switched at will Wireless Bluetooth 5.3 seconds to connect to enjoy a personal concert. Bluetooth 5.3 chip, stable and strong signal reception, faster connection, high-speed transmission and low latency It is a sleep Bluetooth speaker and a mobile phone holder. It is a multifunctional home item that can be used to enjoy music or watch TV shows. Free your hands and place your phone Bluetooth version:Ver.5.3 Supported protocols: +BLE Transmitting power: classII (-6dBm~+4dBm) Frequency (Hz): 2.40GHZ~2.48GHZ Bluetooth transmission distance: 15 meters Charging interface: Type-C Input current: DC5V Battery: 400mAh Battery life: 10-20 hours Charging time: 2 hours Colour:Black Material:ABS Package Contents: 1 x Sleep Speaker 1 x TF Card 1 x Card Reader 1 x Type-C Cable 1 x Chinese and English instruction manual 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.