The Ultimate Music Experience ! Sport exercise headphone, with HD music play, enjoying music and other audio when doing exercise! Highly compatible Bluetooth 4.1, you can connect the headphone easily with your phone. It also has built-in microphone, which can answer the call conveniently without holding your phone. Special magnet attached design prevents tangles when 2 plugs stick together. Light weight makes you easy to wear it even a long time. Features:  - Support multi-point connection, connect with two different devices at the same time. - Can call or answer the phone. - Support voice report number automatically. - Support voice reminding function. - With power consumption display function for iPhone. - With vioce controlling function. - Support song switching.  - CVC 6.0 smart noise reduction. Specifications: Profile support: HSP / HFP / A2DP / AVRCP Cable length: 600mm Product Parameters:Brand: awei Model: A920BL Wearing type: In-Ear Function: Bluetooth, Voice control, Answering phone, Song switching, Multi connection function Connectivity: Wireless Application: Sport Driver unit: 9mm Sound Channel: Two-channel (stereo) Frequency response: 20-20000Hz Impedance: 16ohms±15 percent Sensitivity: 110±3dB Talk time: 6h Music time: 4h Standby time: 200h Charging time: 1h Bluetooth: Yes Bluetooth version: V4.1 Bluetooth distance: W/O obstacles 10m Battery capacity: 55mAh