House of Marley Positive Vibration Frequency Signature Black (EM-JH143-SB) Build: FSC Certified Wood, Fabric, Stainless Steel Headphone Connectivity Technology: Bluetooth Headphone Type: Over-Ear Microphone: Yes Driver/Speaker Diameter: 40 mm Sensitivity: 98 dB Impedance: 32 Microphone Frequency: 20 - 20000 Hz Call Controls: Yes Volume Control: Yes USB Q-ty: 1 Jack Q-ty: 1 Bluetooth: 5.2 Fast Charging: 15min for 4h operating time Type Of Battery: Li-Ion Rechargeable: Yes Charging Time: 2 hours Battery Life: Up to 35 hours Color: Signature Black Weight: 215 g