Description of Wireless Bluetooth Headset Fashion Sports Neckband Bluetooth Headset for lenove iphone oppoFeatures: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

Description of Wireless Bluetooth Headset Fashion Sports Neckband Bluetooth Headset for lenove iphone oppoFeatures: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 2.1Frequency: 2.4 - 2.48GHzSupport format: MP3 WMATalk time: Up to 4 HoursCharge time: 2 hoursPower source: Built-in Li-ion Battery (USB  Charging)System requirement: Windows 98 or aboveMaterial: PCItem color:BlueItem size: 15 * 13cm/ 5.9 * 5.1inItem weight: 33g/ 1.2ozPackage size: 19.5 * 16.5 * 7cm/ 7.7 * 6.5 * 2.8inPackage weight: 85g/ 3oz