Volkano Rush Series Bluetooth Earphones (VBS201BK) - Bluetooth Version: 4.2, Chipset: JL, Profile: A2DP, AVCTP, AVDTP, AVRCP, HFP, SPP, SMP, ATT, GAP, GATT, RFCOMM, SDP, L2CAP, Bluetooth Range: 10m, Driver Size: 10mm, Impedance: 32ohm, Frequency Range: 20hz-20khz. Sensitivity: 110dB at 1khz, Battery: 70mAh, Charging Time: 2 Hours, Charging input: mDC 5V, Playtime, (MAXIMUM volume ): 3-4 Hours