GTD Audio 50W SH-120B Portable PA System Wireless Hand-held Headset Lapel Lavaliere Microphone Unit Runs By 110 Volt power or Rechargeable Battery Frequency: 170Mhz-250Mhz Built-in rechargeable battery and charger 1/8" Audio ( MP3) input jack, 1/4" microphone jack 25 Watts RMS 50 Watts Mix