Media tech MT3589W headphones (in-ear; Bluetooth; with built-in microphone; black

Efficiency Wearing style: In-ear Product type: Headphones Package contents User Manual: Yes Suitcase: Yes Ports and interfaces Connection method: Wireless Bluetooth: Yes Battery Rechargeable battery: Yes Battery type: Lithium-ion (Li-Ion) Charging source: Battery Microphone Noise Cancellation Effectiveness: No 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.