Bluetooth Version: 5.0, Dynamic Driver: ф40mm, Impedance: 32±15% ohm, Sensitivity: 115±3dB (at 1kHz/1mW,With IEC60711 Coupler), Battery type: Lithium-ion Polymer (3.7V, 500mAH), Charging time: 2 hours, Music play time: up to 22 hours, Compatibility: Use with phones, tablets, computers.