Features: Mini in ear wireless invisible designed, super small size and can be in the ear, no wearing burdens. 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. Specifications: Material: ABS Color: Black, Silver, White, Rose Gold, Yellow (optional) Length: about 2.8cm/1.10inch Model: YX01 Bluetooth-compatible Version: V4.1 Waterproof Level: IPX5 : 50mA rechargeable lithium-battery Standby-time: about 100hrs Calling-time: about 4hrs Package Includes: 1x Earphone(single ear) Note: Please allow 0-1cm error due to manual measurement. Please allow for slight color difference due to different monitor resolution.