Topnisus Over-the-Head Bluetooth Headset with Mic Stereo Bluetooth Headphone for Music Listening/Calling (TN-M20) Bluetooth 4.1 TECHNOLOGY - Faster and more efficient than ever before, Bluetooth 4.1 versions with high efficiency and stable wireless data transmission. NOISE CANCELLING CRYSTAL CLEAR SOUND  nice tone quality, good for listening to music and calling SUPPORTS ONLINE CONVERSATIONS & GAMES - Skype, QQ, MSN, PS3 etc., TOUCH BUTTON SUPPORT - Call answer /end, redial, volume control and voice dialing UNIVERSAL USAGE - Compatible with most Bluetooth mobile phones that with Bluetooth function