AKG PT420 Band M, Pocket Transmitter, For the AKG WMS420 radio system, Frequency range: Band M (826,300 - 831,000 MHz), Built-in charging contacts for optional CU400 battery (battery not included), 3-Pin mini XLR connector, Crack-free on / off / mute switch, Audio transmission range: 40 - 20,000 Hz, Transmission power: 10/20 mW (band M), Power supply: 1x 1.5 Volt AA battery / rechargeable battery, Dimensions: 60 x 75.5 x 30 mm, Net weight: 60 g