KKmoon LED Display Automation Digital Delay Timer Control Relay Switch Module 3V/3.7V/4.5V/5V/6V Can be powered by 3.7V lithium battery, 5V power bank, switch power, transformer, etc. Low voltage for power supply, the lowest is 3V, convenient for use. Adjustable delay time range: 0.1s to 999 minutes. The use of opto isolated input and output, enhanced anti-jamming capability and consumption. The setting parameters can be memorized after power off. To ensure stability, industrial grade PCB board. Applied to control motor, bulb, LED light string, mini pump, etc.