A. The 501K - 1 is a manual engine control module designed to manually control the engine via the key switch on the front panel. B. This module is used to start and stop the engine and indicate fault conditions. It can automatically shut down the engine, indicate engine faults through LED lights, and provide a real - time alarm for the first - occurring faults. C. Specification parameters: - DC power supply: Continuous 9 - 33V. - Alternator input range: 15 - 305V AC. - Alternator input frequency: 50 - 60Hz at the engine's rated speed. - Magnetic input range: 0.5V - ±80V. - Magnetic input frequency: 2300Hz - 6000Hz. - Relay output: 16 amps DC at the power supply voltage. - Running relay output: 16 amps DC at the power supply voltage. - Alarm output: 1 amp DC at the power supply voltage. - Operating temperature range: - 30 - 70 degrees Celsius. D. Color: Black. E. Material: Plastic. F. Package contents: - 1 engine control module. - 2 accessories. - 2 keys. G. Only the above - mentioned package contents are included, and other items are not included. H. Note: Light and different displays may cause slight differences between the color of the item and the actual object. The allowable measurement error is ±1 - 3 cm.