HP BM200 Bluetooth Headphone Features Bluetooth version: V5.0 Battery Life: up to 22 Hours Battery capacity: 500 mAh Driver Diameter: 40mm More headphones 40mm Driver Diameter , so that the overall earphone hearing better, full bass, high-pitched bright, rich details in the ear beat. Two enjoyment of two connectives: by high quality 3.5mm audio cable or by Bluetooth technology . Comfortable in ear: using high quality and breathable earcups, no deformation rebound, soft and comfortable. Huge battery life, balance left and right. 500mAh high capacity ,charging 4hours it will work up to 22 hours, no worries of the power.