Timer shutdown: Double-click the "On/Off" button to enable the timer shutdown function, no need to get up at night. others: The private speaker under the pillow can not be heard by people outside the bed, and does not affect others. Light weight: 30g thin design, flat shape placed under the pillow without a sense of foreign body, senseless sleep. Support TF card playback: No need to connect other devices can also enjoy music anytime, anywhere. Long lasting battery life: 400mah rechargeable battery, the battery comes with a protective plate, standby 150 days, 15 hours of continuous play. Product parameters Product Name: Bone conduction sleep speaker Product model: QY10 Charging mode: type-c Standby time: 150 days Bluetooth version: 5.3 Working voltage: 3.1V-4.2V Built in battery protection board: 400mAh lithium polymer Transmission distance: 10 meters (barrier free) Features: Bluetooth playback, TF card playback, LED display screen, timed shutdown, battery level display. Material: plastic colour: Gray Package Contents: 1 x Bluetooth Speaker 1 x Charging Cable(NO retail package) 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.