Samson SWSYSLM-N AirLine Synth Wireless System - Lavalier LM10 (AL300/AR300) AL300 Frequency-agile synthesized belt pack transmitter with over 300 channels*, Ultra small, micro-size belt pack, IR transmitter channel set LCD display, Mute switch, 15 dB pad for hot pick-ups, Gain control, Low battery indicator, Mini XLR connector, Includes LM10 lavalier mic Frequency-agile synthesized True Diversity receiver with over 300 channels*, Automatic Channel Scan to select the clearest frequency, Infrared transmitter channel set 50mm x 20mm backlit LCD display, Metal half-rack chassis, Dual front-mounted removable TNC antennas, Squelch control XLR and 1/4-inch balanced outputs, Mic or line level switch, 11 simultaneous systems**, Rack mount kit included