Feature: 1. Extremely light weight, painless to wear for a long time, the latest ergonomic concept, completely fit outside the auricle. 2. Clear calls, high quality: built-in high-performance lithium battery, about 20 hours of battery life, 1-2 hours of fast charging. 3. The speaker unit is an external speaker close to the ear, but not in the ear. It will help you hear your surroundings at the same time, keep you safe while cycling, running, driving, and more convenient for business, work. Description: Product name: Replacement Nib Model: V28 Waterproof level: IP4 Compatible system: compatible for IOS/ANDROID/WINDOWS Features: 5.2 wireless Bluetooth-compatible Bluetooth-compatible: 5.2+EDR Battery type: polymer lithium battery Headphone battery capacity: 110mAh Charging method: USB socket charging Headphone charging time: about 120 minutes Headphone battery life: about 20 hours Control method: button Colour: Black Packing list: Single Ear Headset x 1 Charging Line x 1