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.