1.Specification:1)Bluetooth Version: 4.1+EDR2)Changing voltage: MICRO USB 5V3)Working current: 25-30 mA4)Output power: 2x20mW5)Blue tooth working range: 10M6)Frequency range: 2.401-2.480GHz7)Frequency response:20HZ-20KHZ8)SNR : S/N��959)Distortion factor: �� 1%10)Bluetooth Name: QY72.Dimensions: 167.3mm(L) x 135.6mm(W)x 16.9mm(T)3.Features:1)Up to 10 hours play time2)Up to 10 hours talk time3)Up to 360 hours standby time4)Less than 2.5 hours changing time5)Unique neck-strap design for easy carrying6)Ultra light weight for all day comfort7)Easy magnetic earphone storage8)Noise reduction & Echo cancellation4.Compatible Model:Compatible with Bluetooth 1.1/1.2/2.0/2.1 and above， devices providing the providing the Bluetooth Headset(HSP) and Handsfree(HFP) Profiles. Enjoy wireless freedom and use this device with Bluetooth phone.5.Package Includes :100% brand new!!1 X Wireless Bluetooth HandFree Sport Stereo Headset headphone