The TR-D100IVE Universal Transmitter can be used with any standard contact or sensor, this reduced/size universal transmitter is fully supervised and includes two built in reed switches that support up to a 0.6-inch gap. It can support an N/O or N/C external contact when using the reed switch. It also includes case, wall tampers, magnet that supports a 5/8-inch gap and a 3.0V Lithium battery.