Driver unit :13mm NdFeB drivers Bluetooth version :Bluetooth V4.2 Supported Profiles :HFP, HSP, A2DP, AVRCP Playtime :About 8 hours Frequency response :20 - 20,000 Hz Sound pressure level (SPL) :100 dB Nominal impedance :32 Ohm Battery capacity :210 mAh Weight :42 g