Built-in 800mAh safety lithium battery, using low-power and -power technology, 2 hours fast charge, providing long battery life.<br> LED display Real-time monitoring of power: with LED digital display, real-time monitoring of the power of the headset, charging in time when there is no power, the power is clear at a glance.<br> Bluetooth + memory card, can play music. A Bluetooth mobile phone with a memory card can listen to music without a mobile phone. The large memory card can listen to 10,000 songs. Connect immediately after booting. Memory linkage function, can be used after booting, built-in Bluetooth 5.0 chip, can quickly search for data and memory-unit<br> lOS smart voice assistant press and hold for one second to call Siri: our smart voice assistant, Press the headset, you can call the voice assistant, the privacy around you, convenient and comfortable<br> neck hanger can be bent arbitrarily: smooth skin-friendly material, unique memory arc, automatically re- to restore the original shape, adjust the arc at any time, more comfortable and natural to wear.<br> Fully compatible: It can be used in conjunction with Bluetooth, supports multiple APP platforms, and is widely compatible with Android, IOS, and Windows systems.<br> Bluetooth version: v5.0<br> Transmission distance: 10 meters<br> Battery capacity: 800 mAh<br> Use time:100 hours<br> Charging time: about 2 hours<br> Support TF card 32-128G to play music(TF Card not included)<br> Material:ABS<br> colour:black<br> Package Contents:<br> 1 * Bluetooth earphone<br> Only the above package content, other products are not included.<br> Note: Light 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.