Technical specification: Bluetooth Specification: 4.1+EDR Noise reduction: CVC6.0 Transmission distance: 30ft Product size: 3.5*3.3*1.3in Net weight: 18.4g /0.65 oz Battery: lithium-ion polymer 85mAh Charging port: Micro USB Charging time: 2h Work time: 7h Standby time: 240h Accessories List: ?1～USB to Micro USB charging cable ?1～User manual ?2～Sets of extra ear tips ?1xCarrying case