AKG K-915 Digital Wireless Home Headpohne - up to 30 m rang, digital 2,4 GHz connection, upt o 8 h battery-range, over-ear, 40 mm drivers, 32 ohms rated impedance, 100 dB efficiency, frequency response: 18 - 16000 Hz, includes transmitter base and cable with 3,5 mm plug, color: black