Features 1、With power and relay action instructions, the suction is bright and the disconnection is not bright. When there is a signal at the signal input terminal, the common terminal and the normally open terminal will be connected 2、Can be used as a microcontroller development board or PLC module, can be used as home appliance control 3、Control DC or AC signal, the maximum can control AC and 30V DC load 4、Single pole double throw, blue KF301 terminal is more convenient to connect control line 5、Adopted of high quality electronic components, and accuracy process, ensure for the durability Specification Item Type: Relay Module Description: Low level: 3V Single pole double throw Size: Approx. 74 x 44mm / 2.9 x 1.7in Notes on the Trigger Mode of High Level and Low Level: Package List 1 x Relay Module