Efficiency Wearing style: On-ear Product type: Headphones Package contents User Manual: Yes Ports and interfaces Bluetooth: Yes Connection method: Wireless Battery Battery type: Lithium-ion (Li-Ion) Charging source: Battery Rechargeable battery: Yes Battery life: 30 hours Microphone Noise Cancellation Effectiveness: Yes Safety warning Warnings Keep away from children. Do not use near sources of heat or fire. Check the condition of the batteries regularly to prevent leakage.