Features
Equiped with high-current relay AC 250V 10A
DC 30V 10A With 4 fixed screw holes hole diameter: 3.1mm
Optical coupling isolation good anti-interference
VCC system power JD_VCC relay power default 5V relay just plug in jumper cap
Indication LED's for Relay output status
Great for DIY project
General Specs
Material PCB 
Chipset PC817
Bits 32-bit
Dimension  5.1 x 3.87 x 1.8 cm
Weight 30 g