The Model 501K-1 is a Manual Engine Control Module, which has been designed to manually control the engine via a key switch on The front panel. The module is used to and stop the engine, indicating fault conditions automatically shutting down the engine and indicating the engine failure by LED giving true first up fault annunciation. SPECIFICATION DC Supply- - 9-33V continuous. Alternator Input Range- - 15-305V AC Alternator Input Frequency- - 50-60Hz at rated engine speed. Magnetic Input Range- - 0.5V-80V Magnetic Input Frequency- - 2300Hz-6000Hz Relay Output- - 16 Amp DC at supply voltage Run Relay Output- - 16 Amp DC at supply voltage Alarm Output- - 1Amp DC at supply voltage Operating Temperature Range- - - -30-70celsius Colour: black Material: plastic Package Contents: 1 x Engine Control Module 2 x Accessories 2 x Key Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.