Bluetooth 4.1 providing strong signal,with A2DP bluetooth profiles and APTX tech,ensure smooth and crystal clear voice.Unique detachable neckband design,easy and fast install,makes more stable wearing also protect battery.Smart magnetic design,prevent earbuds falling off and lost effectively.Makes more fashion and more convenient.Three size soft earbuds(S/M/L) to fit different size ear well.Fast pairing and automatic pair in next time,battery met.....More detail