Under Pillow Bluetooth Speaker Sleep Aid Bone Conduction Soundbar MP3 LED Power Display Mini Sound box Bluetooth Sleep Timer Aluminum alloy material, full of texture Dual speakers for better sound quality and unrestricted sound production Dual mode playback, one click switch between listening to music and reading modes Sleep timer, making the product more energy-efficient LED display screen, precise display (White noise helps you relax and fall asleep, bone conduction channels do not spread into the ear, and not cause damage to the ears and hearing) Product name: Bone conduction sleep speaker Charging mode: type-c fast charging Standby time: 150 days Bluetooth version 5.2 Working voltage: 3.7V-4.2V Product size (mm): 100 x 28 x 13mm Net weight (g): 35.5g Internal battery: 400mAh lithium polymer Transmission distance: 10 meters (obstacle free) Color: Gray Material: Aluminum ABS Package Contents: 1 * Bone conduction speaker 1 * Charging cable 1 * Chinese and 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.