AKG PW45 Sport Set ISM - Perception UHF wireless system with pocket transmitter and C544L headset microphone, 4 switchable frequencies ISM range (863,100 - 864,900MHz), 9.5" diversity receiver with internal antennas, adjustable output volume, XLR out, transmitter requires 1x AA or rechargeable battery, low battery display, on/off/mute switch on transmitter. Includes power supply, C544L and 1x AA battery. No licence needed, free to use all over Europe.