Features: 

Single Track. 

Portable behind-the-head wearing design, convenient for sports. 

Allow you answer or reject phone calls anytime and anywhere. 

Built in Microphone for Handsfree Cell Phone use or chatting on QQ, MSN. 

Built-in lithium battery (charged via USB). 

Specifications:

Bluetoooth

Features: 

Single Track. 

Portable behind-the-head wearing design, convenient for sports. 

Allow you answer or reject phone calls anytime and anywhere. 

Built in Microphone for Handsfree Cell Phone use or chatting on QQ, MSN. 

Built-in lithium battery (charged via USB). 

Specifications:

Bluetoooth version:Version 2.0 

Protocol: HFP, HSP 

Frequency: 2.4 - 2.48GHz 

Support format: MP3 WMA 

Talk time: Up to 4 Hours 

Charge time: 2 hours 

Power source: Built-in Li-ion Battery (USB Charging) 

System requirement: Windows 98 or above 

Material: PC Item 

Color: Blue 

Item size: 15 * 13cm/ 5.9 * 5.1in 

Item weight: 33g/ 1.2oz 

Package size: 19.5 * 16.5 * 7cm/ 7.7 * 6.5 * 2.8in 

Package weight: 85g/ 3oz