Timed shutdown:Double-click the "on/off" button to turn on the timed shutdown function,so you don't have to get up at night others:The private speaker under the pillow cannot be heard by people outside the bed,and does not affect others. :30g thin design,flat shape,no foreign body feeling under the pillow,no sense of sleep. Support TF card playback:You can enjoy music anytime,anywhere without connecting to other devices. Long-lasting battery life:400mah rechargeable battery,battery comes with a protection board,standby for 150 days,continuous playback for 15 hours. Charging : type-c Standby time: 150 days Bluetooth version: 5.3 Working voltage: 3.1V-4.2V Product size (mm): 100x32x15 Built-in battery protection board: 400mAh lithium polymer Transmission distance: 10 meters (barrier-) Function: Bluetooth playback,TF card playback,LED display,timed shutdown,battery power display. Colour:White Material:Plastic Package Contents: 1x Bluetooth speaker