Features:High-level trigger: In industrial control, called PNP trigger, negetive trigger, when the voltage between the trigger terminal and the negative pole of the power supply is 0V or close to 0V.Stable performance of electronic components, so that your equipment can work stably.High sensitivity of products.The use of the product expansion capability, can be used for all types of DIY.With fuse to ensure the safe use of this module.Specification:Type: 1 ChannelWeight: Approx.12g/ 0.4ozRated current: 2AVoltage: DC 5V/12V (Optional)Package List:1 * SSR ModuleNote:DC +: positive power supplyDC-: connect power negativeThe CH terminal is the trigger terminal of the module. When there is a trigger signal, the output switches (A, B) of the solid state relay will close. The load will be conductive.