Unique neck-strap design for easy carrying Ultra light weight for all day comfort Vibration Alert on call Easy magnetic earphone storage Noise reduction & Echo cancellation Specification: Changing voltage: MICRO USB 5V Working current: 25-30 mA Output power: 2x20mW Blue tooth working range: 10M Frequency range: 2.401-2.480GHz Frequency response:20HZ-20KHZ SNR : S/N95 Distortion factor: 1% Bluetooth Version: 2.1+EDR Weight: 32g Dimensions: 167.3mm(L) x 135.6mm(W)x 16.9mm(T) 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. Include : Smartphone/Pad/MP3 MP4 IPOD Package Includes : 1 X Wireless Bluetooth HandFree Sport Stereo Headset headphone (no retail box) 1 X Micro USB Cable