Freeboss Kv-22 VHF Dual Way Handheld Wireless Microphone (258.56MHz, 231.02MHz) FIXED Frequency!!! If you want to use 2 sets or more wireless mic at same time, please buy different frequency microphone. Same frequency microphone can not be used at same time. // How to Use: Wireless Microphone--------Audio Mixer--------Amplifier------Speaker // Wireless Microphone--------Amplifier------------Speaker // Wireless Microphone--------Amplifier Speaker Dual VHF System, 2 Handheld Microphones Included (Frquency: 258.56MHz, 231.02MHz) Power On/Off Switch, Duarl RF & AF Indicators, Volume Controls Plastic handheld, metal receiver,1/4" Audio Cable Included Output:Mixed output // Operation Range: Over 50M (over 160 ft) Connect the receiver to power supply. Turn on the button switch. Use 1/4&#039;&#039;  audio cable to connect receiver to audio device you need (shown in the above figure) Insert 2 AA batteries into microphone and turn on the microphone.