BEASON Running Wireless Waterproof IPX4 Bluetooth Earbud, Sports Workout Wireless Bluetooth 4.1 Headphone with Mic and 6 Hours Playtime, Noise Cancellation Headset with Deep Bass-Blue Color BEHIND-the-NECK STYLE & SECURE FIT -- Comfortable and light weight wireless headphones with three sizes(S/M/L) earplugs, the behind-the-neck style prevents it from falling out of your ears. SUPERIOR SOUND -- Advanced APTX technology offers incredible sound quality with deep bass and crystal clear treble. NOISE CANCELLATION -- Built-in microphone with CVC 6.0 noise cancellation provides high quality music, hands-free phone calling with clear voice even in noisy environment. BLUETOOTH 4.1 -- Latest Bluetooth 4.1 technology provides quick and easy pairing within 30 feet. It can connect with two bluetooth devices simultaneously. Please try to remove your bluetooth devices on your phone and pair again when you have trouble on bluetooth pairing. LONG BATTERY LIFE -- The polymer 100mAh battery in the Bluetooth headphones wireless device provides 6 hours music, 8 hours talk and 200 hours standby.