2015 top selling stereo sports Bluetooth earphone, wireless earphones, Bluetooth 4.1, light -weight, various colors, fashionable style, OEM/ODM available. Product Feature: Bluetooth Version: V4.1 Operating distance: 10-15m Battery: 120mAh/3.7V Standby time: ≥1900hrs Playing time: up to 7hrs Headset Specification Speaker diameter: ￠10mm Impedance: 16Ω S.P.L: 109±3dB/1KHz Rated power: 3mW Frequency Response: 20Hz-20KHz Mic Specification Microphone Unit: ￠4*1.5mm Directivity: Omnidirectional S.P.L: -42±3dB Impedance: ≤2.2kΩ Frequency Response: 100Hz-10KHz Operating voltage: 2V Shenzhen Aoni Electronic Industry Co., Ltd For more information, please visit at: http://www.anc.cn/