Twins Earphone with small size, super light weight. Ensure a secure and comfortable fit for any ear. True high definition sound Equip with Bluetooth 4.2 and CVC 6.0 Noise Cancelling technology to enjoy clear fidelity phone sound.Quiet surroundings offer better sound.Sweat proof protection compatible with this device. you acn use Both or single as your need. HOW TO PAIR? Single Pairing 1.For initial use, press and hold the button for 3 seconds of either earbud and release after the LED flashes between Red and Blue.