JLGtech K1 Wireless Bluetooth Sunglasses Headset Headphones for iPhone Samsung HTC Nokia (Black) A perfect combination of headset and sunglasses. Outdoor sport, good for cycling, running, skiing, climbing Support Handsfree phone call, stereo music With CSR chip Touch control Slide backwards for call answering,rejecting or ending; music play/Pause Charging time:2-3 hours, music playing time reachs 4-6 hours