Buwico 8 Pin MC-45 Microphone Speaker Hand Mic PTT for Kenwood Two Way Radio TM241 TM231 TM421 TM441 TM221 Works with most Kenwood mobile radios with 8-pin RJ connector It includes CALL, VFO, MR, PF, DOWN, UP, PTT Button and LOCK Switch It enables you to talk and listen without having to move the radio,Just clip the mic where convenient and use it to listen and transmit DTMF(Dual Tone Multi Frequency) function will open the radio's squelch only when it receives a DTMF code that matches one pre-programmed into your receiver. Each tranceiver is normally programmed with a unique code Package includes: 1 x Shoulder speak mic