Listening to music doesn't hurt your ears. It's a disruptive , specially designed to soothe your sleep. By using bone conduction technology to transmit sound, it closely adheres to the ear bone. Sound waves directly pass through the bone to reach the auditory , bringing high-quality music without damaging the eardrum. Bone conduction vibration sensing, private and sound-free: Every sound enters the ears, immersing one person in a peaceful auditory feast. Bone Conduction Sleep Kit, just place it under the pillow and open it to enjoy playing light music and improve the quality of sleep. The clear and realistic sound quality as if you were on the spot, along with the rich and powerful bass, present you with an extraordinary listening and enjoying experience. 5.0 Bluetooth chip, intelligent noise reduction: Innovatively adopting the new Bluetooth 5.0 chip, with basic "0" latency, longer connection distance and greater stability. Strong battery life: 20 hours of music playback, 300 hours of super long battery life, small size, big power. Memory pairing, automatic instant connection upon startup: One-second pairing, . Compatible with 99% of devices: Supports smartphones from for , for , for , for , for , for , etc. Transmission distance:10 meters Battery capacity:400mAh Charging time:2 hours Charging method:TYPE-C charging Weight:60g Bluetooth version:V5.0 Working voltage:3.7V-4.2V Playback time:20 hours Standby time:12 days Color:As Shown Material:ABS Package Contents: 1 * Bluetooth speaker 1 * Charging cable 1 * 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.