Hands-free and clear sound: The built-in microphone lets you answer and reject incoming calls, and mute your Bluetooth headset. In addition, the mobile phone Bluetooth headset supports voice assistants. The bluetooth headset adopts QCC-3020 chip, the sound is clearer and the connection is stable. Battery Display Charging Case: The Bluetooth headset has a built-in 55mAh battery, which can be fully charged in 1.5 hours and 12 hours of continuous talk. The charging case shows the remaining power. Comfortable fit: Single ear fit, retractable ear hooks and folding ear bars swivel and swivel for a comfortable fit. It's lightweight and comfortable enough to wear for hours. Bluetooth V5.1: Supports the latest Bluetooth V5.1, which greatly reduces the chance of turning on and off compared to the old version, providing a more stable connection at a distance of up to 33 feet. It can also connect to two devices at the same time.