Samson AirLine Synth Earset - True Diversity UHF Wireless System Includes AL300 Beltpack Transmitter, AR300 Receiver, SE10TX Earset Microphone, RK300 Rackmount kit and ACD1000 Power Supply. Frequency-agile synthesized beltpack transmitter with over 300 channels. Ultra small, micro-size beltpack. IR transmitter channel set. XLR and 1/4-inch balanced outputs.