Features: Portable wireless BT earphones, take out from the charging compartment, automatically turn on and pair. BT5.3 technology has lower power consumption and more stable signal transmission. Threadless earphone is more flexible and convenient, avoid earphone cable winding. Wide application in daily life, driving, listening to music, exercising, playing games, watching videos. 35mAh battery single ear earphone, and charged automatically in the 350mAh charging case. Specifications: BT version: V5.3 Charging compartment capacity: 300mAh Headphone capacity: 35mAh Resistance: 32Ω Transmission distance: 10m Operating time: approx. 4-5H Charging time: 1-2H Colour: black Package size: 15*8.5*4*3CM Weight: 100g Package List: 2 * Headphone 1 * Charging Case