Dostyle Bluetooth Headphones, Wireless Stereo Headset In-Ear Sweatproof Sports Earbuds Earphones with Mic and Soft Ear Hooks (Red) Latest Bluetooth V4.0 Technology & Noise Cancelling. Intelligently filter ambient noise, providing you with super clear sound for calls and music playing. Newest CSR chip to ensure lower power consumption and stable signal transmission. Lightweight & Sweatproof Design. Included a pair of soft earhooks, stable in-ear design earphones, perfect comfortable fit for running, cycling, workout or other activities. Longer Listenning with Our Bluetooth headset. Built-in 60mAh rechargeable battery - 1 hour charging time for about 200 hours standby time or about 4 hours playing time(The volume and environment will effect the time). Quick and Easy Pairing. The pairing range up to 10meters. Long press the power button when the headset it off (the Blue and Red led light quickly flashes in turn, hear pairing), open you bluetooth device to search for X1, then pair it. Compatible with most of bluetooth enabled digital equipment, perfect for mobile phone, tablets, music player, and so on.