Description: KEYS: ① multifunction key (play/ pause, answer /end call) ② Previous/volume increase key ③ Next/volume reduce key ④ Microphone ⑤ AUX Audio port ⑥ Micro USB charging port ⑦ On/off Feature: Brand :AEC, 100% brand new Lightweight, comfortable and adjustable Compatible with Bluetooth enabled devices - easy syncing. Built in rechargeable Li-battery. Built-in Microphone, hands-free. Support 3.5 mm stereo audio input. Incoming call voice prompt. Specification: Bluetooth version: V3.0+EDR Supported profiles: HFP, A2DP, AVRCP Operation Range: 10 meters Play time: up to 10 hours Talk time: 12 hours Standby time: 200 hours Charging voltage: DC5V/500mA Charging port: Micro USB Charging time: 2.5 hours Speaker diameter: 30mm Built-in microphone support digital signal. processing echo cancellation technology. Package: 1x Bluetooth headphone 1x Micro USB Cable 1x English User Manual Thank you for your browse.If you need any help or give us any advice,contact us anytime.Hope to see your shares on SNS platforms and let more customers know our products. For your convenience, please search "elecfan + your product" to take the fastest way to buy other products you want and have a clear view of other products we offer in store. Thank you very much.