SPM-2000 Series - Medium Duty 2-Wire Surveillance Kit: Features acoustic tube earphone with TWIST CONNECTOR, belt-worn PTT box and surveillance style microphone/PTT. Coiled cable.

SPM-2300 Series - Medium Duty 2-Wire Surveillance Kit: Features acoustic tube earphone with TWIST CONNECTOR and surveillance style microphone/PTT. Straight cable.

SPM-3300 Series - Heavy Duty 3-Wire Surveillance Kit: Features acoustic tube earphone with TWIST CONNECTOR, remote PTT switch and low-profile lapel microphone. Straight cable.