Multi-channel wireless system with lavalier microphone. 30MHz selectable bandwidth. The PT 45 pocket transmitter is compatible with all AKG micro mics including the supplied CK 99 L lavalier mic, and provides up to 8 hours operation from a single (supplied) AA battery, gain control and noiseless on/off/mute switch. SR45 receiver as above. UK power supply included. Band D operates on licence-free channel 70 (ISM) frequencies. Band U systems operate on channel 38.