Features 1、Equipped advanced high-quality timing chip control with accurate timing, have much better performance than the 555 chip 2、The trigger end has a opto-isolator with strong anti-interference ability, you can use a normally open type switch or sensor to trigger the module 3、There are 8 kinds of time range options, the shortest is 0.1 second, and the longest is 1 hour. Also has protection diode to anti reverse power connection to protect the module better 4、Possess delay adjustment potentiometer, clockwise adjustment the time will be longer 5、Suitable for home intelligent systems, anti-theft alarm delays, door control systems, automatic equipment control, PLC industrial control, electronic development, etc. Specification Item Type: Trigger Delay Relay Application: This module is a trigger delay module when the switch is turned on instantly. Can be used in home intelligent systems, anti-theft alarm delays, door control systems, automatic equipment control, PLC industrial control, electronic development, etc. Can be connected to large current load (250Vac|10A or 30V dc 10A) Package List 1 x Trigger Delay Relay