Built-in 800mAh safety lithium battery, using low-power and micro-power technology, 2 hours fast charge, providing long battery life. 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. Bluetooth + memory card, can . A Bluetooth mobile phone with a memory card can listen to music without a mobile phone. The memory card can listen to 10,000 . 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 lOS smart voice assistant press and hold for one second to call Siri: our smart voice assistant, Press the headset, you can call assistant, the privacy around you, convenient and comfortable neck hanger can be bent arbitrarily: smooth skin-friendly material, unique memory arc, automatically re-bind to restore the original shape, adjust the arc at any time, more comfortable and natural to wear. Fully compatible: It can be used in conjunction with Bluetooth, supports multiple APP platforms, and is widely compatible with Android, IOS, and Windows systems. Bluetooth version: v5.0 Transmission distance: 10 meters Battery capacity: 800 mAh Use time:100 hours Charging time: about 2 hours Support TF card 32-128G to (TF Card not included) Material:ABS colour:black Package Contents: 1 * Bluetooth earphone Only the above package content, other products are not included. 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.