QY7 bluetooth 4.1 neck bluetooth in-ear stereo vibration headphones-neck earphones-cellphone headphones-neck phone headset by sunwand with sweatproof earbuds(Black) Unique neck bluetooth Designed: The vibration headphones has lightweight and comfortable neckband designed, made of ultra-light shape memory alloy, especially for easy carrying for all day comfort. Sunwand neck earphones ensures a 100% comfortable fit when you are hiking, cycling, exercising and staying at home or in the office; This cellphone headphones easy to handle ear set with Magnetic Holders. Neck phone headset has bluetooth 4.1 CSR BC8 Chipset with A2DP stereo tech provides you a Hi-Fi quality stereo music, crystal clear sound; Sunwand neck bluetooth headphone has In-coming phone number reporting and connect Two phones simultaneously, you'll never miss any phone call. Sunwand vibration headphones apply One Key Switch Function: It's easier to operate the wireless bluetooth neck earphones with just on key function no need to press and hold the button for 7 seconds; sports bluetooth cellphone headphones has Vibrating Alert on power on/off so if you can't hear it you can still feel it; Also with pause & play; next & previous song; answer & hang up call; volume +/- button to control. Neck phone headset outstanding Long Battery Life: Sunwand neck bluetooth headsets build in 350mAh rechargeable Li-Polymer battery, 20 hrs music play time, 20 hrs talk time, 500 hrs standby time with a full charge; Battery level of the vibration headphones will be displayed on iPhone. Noise Reduction Technology: Built-in neck earphones with latest CVC noise reduction and echo cancellation tech, let you get high quality music, hands-free phone conversation with clear voice even in noisy environment like inside a gym and running/cycling on the road.