Timed Shutdown: Double-click the "on/off" button to activate the timed shutdown function, so you don't have to get up in the night. Privacy: The private under-pillow speaker is inaudible to those outside the bed and won't disturb others. Thin Design: 30g thin design, flat shape, no foreign body sensation under the pillow, comfortable sleep. TF Card Playback Support: Enjoy music anytime, anywhere without connecting to other devices. Long Battery Life: 400 mAh rechargeable battery, battery comes with a protective circuit board, 150-day standby, 15 hours of continuous playback. Charging: Type-C Standby Time: 150 days Bluetooth Version: 5.3 Operating Voltage: 3.1V-4.2V Product Size (mm): 100x32x15 Built-in Battery Protection Circuit Board: 400 mAh lithium polymer Transmission Distance: 10 meters (without obstacles) Function: Bluetooth playback, TF card playback, LED display, timed shutdown, battery level display. Color: White Material: Plastic Package Contents: 1x Bluetooth Speaker 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 to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.