Ergonomic earphone designed, which ensures stable in ear, great for driving, sports, business and daily leisure.Built-in DSP noise reduction technology, provide you clear voice and enjoy better listen effect. Bluetooth-compatible V4.1, lower power consumption, faster transmission. IPX5 waterproof, sweat-resistant and rain-resistant, even for long outdoor sports or cycling, hiking, running and exercise, you will no longer worry about sweating. Single multi-functional button, one click operation for turn on off, switching songs, switching languages and answering/declining call.