The use of the product expansion capability, can be used for all types of DIY.
High sensitivity of products.
With fuse to ensure the safe use of this module.
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.