Nady Single-Channel UHF Wireless Portable PA System With Lavaliere Microphone - 800.200MHz Powerful 20W audio output receiver/amplifier operating in the wide-open upper UHF band with built-in echo/reverb unbalanced input jacks: 1 mic, 1 aux, 1 unbalanced Record Out, treble and bass controls External AC/DC (1-15V) or internal battery powered (8 D batteries) internal charging ports for transmitter 9V rechargeable batteries UB-4 compact bodypack with screw on jack for lavaliere microphone input Input level control for optimum sound adjustment Rugged ABS housing with external antenna Off/mute/on switch for easy use