Wireless transfer. Rechargeable Lithium battery of 300mAh. Autonomia: 7hs. Folding design. Integrated microphone. Removable cable. Connection: 3.5 mm Jack and Memory Card Slot. Driver: 40 mm. PU pads. Frequency response: 20Hz - 20KHz. Sensibility: 95 dB. Charge type: USB 5V. Weight: 248 g.