Features: It is a timer relay module with high precision, stable and reliable performance. Support 2 modes, mon mode(once) and cycle mode, and you can simply switch mode by adjusting the jumper. There are many voltage and time range for your choice, both "on" time and "off" time are adjustable. It is great to control the reciprocating stroke, or repetitive power on and off for equipment and products burn-in test. Widely used on timer operating equipment, machine repetitive test circuit, fish tank intermittent pump, etc. Specifications: Type: DC5V,0-15min/DC5V,0-60min/DC12V,0-15min/DC12V,0-60min/DC24V,0-15min/DC24V,0-60min (Optional) Max. Load Capacity: 10A250VAC, 10A30VDC Size: 70*20mm / 2.75*0.78" Time Error: <2% How to Set Time Quickly: Time can be quickly set by measuring voltage(Uc) of resistor. Take a 5V 15min module as example. If Uc=2V, time=2V/5V*15min=6min. Package Includes: 1 x Timer Relay Module