Features 1、Product Introduction: This is a high and low level trigger 4 channel relay module that can control 4 loads. Sensitive and reliable, giving you a good experience. 2、Large Load Capacity: High power relay is adopted with large load capacity, and the maximum control load can be connected to 30A and . 3、Strong Driving Ability: This module features optocoupler isolation, strong driving ability and stable performance. Trigger current is 5mA. 4、Easy Using: This module is easy to use, with screw terminals designed for easy connection. You can take it with confidence! 5、Easy Installation: Comes with 4 mounting holes, this module is easy to install and you can put it into use immediately! Specification Item Type: Relay Module Material: PCB Product Size: Approx. 143 x 60 x 20mm / 5.63 x 2.36 x 0.79in (L x W x H) (0-1V low level relay OFF) (1.5-5V status high level relay ON) Input Part: DC-: Connected to the negative pole of power supply Meaning of High Level and Low Level: Package List 1 x Relay Module