AKG HT420 Band M, UHF hand transmitter of the WMS 420 series, Dynamic D5 capsule with super cardioid characteristics, 3-step switch on / mute / off, Frequency response: 70 - 20,000 Hz, Switchable transmission power 10/20 MW, Operation with 1x 1.5 V AA battery up to 8 hours, Integrated charging contacts for optional CU 400