1. Without the obstacle of cables, set you free to walk, run. 2. Bluetooth V4.2: wireless headphone technology provide faster pairing speed, stable connection, and let you enjoy crystal clear audio, stereo sound. 3. The earbuds work with all smartphones, tablets and bluetooth enabled devices. 4. Charging Case Battery Capacity: 450mAhSpecification: General Model XHH-ES60 Bluetooth Version V4.2 Transmission Distance Up to 10m Working Voltage 3.7V Battery Battery Capacity 50mAh Charging Time 40 minutes Music Time about 3 hours Dimensions & Weight Item Size 26*17*20.8mm Earbuds Item Weight 8g Earbuds Package Weight One Package Weight 0.19kgs / 0.42lb One Package Size 14.3cm * 10cm * 4cm / 5.63inch * 3.94inch * 1.57inch Qty per Carton 60 Carton Weight 12.00kgs / 26.46lb Carton Size 42cm * 32cm * 31cm / 16.54inch * 12.6inch * 12.2inch Loading Container 20GP: 640 cartons * 60 pcs = 38400 pcs40HQ: 1485 cartons * 60 pcs = 89100 pcs