1.True bone conduction technology, placed under the pillow, enjoy the private speaker, do not affect others;Comfortable and beautiful, gentle whisper, soothing sleep; 2. Built-in 4 natural white noise sound sources, free to switch; 3. Bring in 30 minutes and 60 minutes of two gear timing; 4. Sleep at night, office nap, baby sleep, more people's choice. Rated input:DC 5V / 1A Bone conduction oscillator:2 Bluetooth version:5.1 Bluetooth name:Z-sleep Bluetooth distance:5-10M Bluetooth protocol:A2DP, AVRCP, HSP, HFP Play duration:about 10 hours Charging time:about 1 hour Colour:White Material:plastic Size:155x36x13mm Package Contents: 1 * White Noise Speaker 1 * USB Cable 1 * Chinese and English 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.