Bone conduction music box, only need to be placed under the pillow to turn on, no need to wear and ears, long-term use without harm. Using Bluetooth 5.0 chip set, low power consumption, stable call, clearer sound. Built-in 400mah battery, can work for 10 hours after fully . Simple operation and convenient charging, Long press to power on and wait for Bluetooth pairing, and after successful connection and pairing. The Bone Conduction Speaker is the smallest and most versatile bone conduction speaker that allows you to have a different but still spectacular sound experience anywhere, in any setting. Bluetooth Transmission Distance: 10m Battery Capacity: 400mAh Power: 5V Bluetooth 5.0 Playtime: 20h Colour:White Material:plastic Package Contents: 1 x Bone Conduction Music Box 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.