Cooligg CL-900 Bluetooth Wireless Sport Headset 4.1 Sweatproof Skidproof Earbud Noise Cancellation Stereo Headphone for Smartphones Bluetooth 4.1+A2DP in-ear earphones sweatproof and skidproof design in cable and buttons, providing comfortable and outstanding listening experience either during exercising or leisure time. Noise-isolation design; In line controls, clear voice prompts; responds very well to the equalizer application of your Bluetooth devices. Automatic pair with your Bluetooth device after the first manual pair; able to connect 2 active Bluetooth devices; enjoy handsfree calls and music. Stand-by time: 140 hours ;charging time: 1.5-2 hours; talk time: 5 hours; music play time: 4 hours Includes 2 extra pairs of buds (you get small, medium, large).