AKG PW45 Presenter Set B2, Perception Wireless, UHF Wireless System with pocket transmitter and CK 99 L lapelmicrophone, 5 switchable frequencies in range B2 774,100 - 777,900 MHz, 9,5" diversity-reveiver with internal antennas, adjustable output volume, XLR out, transmitter works 1x AA Battery or rechargeable battery, low-Battery-display, on/off/mute switch on transmitter, incl. powersupply, CK 99 L and 1x AA-battery. Please note: Due to every country having different regulations, you may need to contact your local licensing authorities before using a wireless system.