Multifunctional: Equipped with features of BT connection, TF card music playing, AUX-IN wired music playing, FM radio, earphone monitoring, and hands-free call with Microphone BT Connection: BT5.3 technology ensures stable and quick connection, easy to pair with almost all the BT-enabled audio devices, freely to enjoy wireless music and hands-free calls. AUX-IN Function: When in power off status, connect to the audio devices (such as MP3/MP4, Laptop, etc) without BT function via the 3.5mm audio cable (NOT included) to enjoy music Detachable Microphone: HD microphone reduces ambient noises and grasps the detail of voice. You can get high-quality hands-free phone conversation. Long press M key can mute mic Earphone Monitoring: Supports KTV mode. In this mode, you can read, recite or sing into the microphone, and the headphones pick up your voice, allowing you to immerse yourself in your own singing or revision Ergonomic Design: Adjustable headband length, foldable soft leather ear cushion, comfortable to wear, suitable for different head sizes, and easy for storage Long Battery Life: Built-in 300mAh rechargeable battery lasts up to 25 hours of music playing time per charge cycle (depending on music volume). Charging time is about 2 hours Specifications: BT Version: 5.3 Support Profiles: HFP, HSP, A2DP, ACRCP Operation Range: 10 meters (no obstacle) Frequency Response: 20Hz-20KHz Impedance: 32 Sensitivity: 1053dB Battery Capacity: 300mAh Working Time: about 25 hours (depends on music volume) Standby Time: about 300 hours Charging Time: about 2 hours Charging Port: Micro USB Item Size: approx. 19.5*16.0*7.7cm/7.67*6.29*3.03in Item Weight: 170g/5.99oz Package included: 1 x Over Ear Headset 1 x Detachable Microphone 1 x Charging Cable 1 x English User Manual Other items not include