Bluetooth 5.4 mode:Adopting high quality Bluetooth chip, equipped with high performance chip, faster and more stable, low latency and low power consumption, clearer sound.10 kinds of stress-reducing sleep-aiding sounds:Let you say goodbye to negative emotions, different sound scenarios to make you feel calm and sleep soundly.Don't disturb the person next to your pillow:Vibration playback exclusive music, watching short videos, listening to music, will not disturb the pillow.Light weight:Slim and lightweight design, flat shape, easy to put in your pocket, convenient to carry.Multiple playback modes:Support Bluetooth playback, comes with TF card slot, supports up to 128GB TF card playback.Timer shutdown:Automatic timer shutdown after 60min, easy to set, no need to get up to operate, sleep until dawn.Powerful 8h battery life:300mah rechargeable lithium polymer battery, fast charging, long battery life.Product name: Bluetooth bone conduction music box (TF models)Charging voltage: 5V/300mAOperating voltage: 3.7/4.2VBattery capacity: 300mAhBluetooth version: 5.4Bluetooth distance: 10mCharging interface: Type-CCharging time: 2 hoursPlayback time: 8 hoursColour:Light BlueMaterial:plasticPackage Contents:1 x bone conduction sleep monitor1 x USB cableOnly 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.