Bluetooth Headset, BlueFit RUNNER 93 HD Stereo Wireless Bluetooth Headphones (Red) Bluetooth CSR 4.0, high fidelity sound quality and stable connection (without any obstacles). Lightweight memory flex neckband design with magnetic earphone holders allows maximum freedom on the run. Perfect Bluetooth headset solution for different occasions Ultra durable built-in rechargeable lithium battery provides up to 8 hours music time, 12 hours talk time and up to 15 days standby time Built-in microphone, multifunctional key allows you power on/off, answer/hang up/reject the call, pause and play. Easy to operation. Softable and flexible,superior comfortable wearing. Sweatproof, perfect for running, doing exercise, gym, fitness, sports etc.