The module uses authentic quality relay, normally open interfaces, maximum load: AC 250V / 10A, DC 30V / 10A. Uses SMD isolation optocoupler, capable of driving with stable performance. Trips at 5mA current. Operating voltage of the module is 5V. The module can be triggered high or low via a jumper setting. Fault-tolerant design ensures operation even if wiring is incorrect. Power indicator (green), relay status indicator (red). Interface module: 1. DC: positive supply (VCC) 2. DC: power negative (GND) 3. IN: control relay, compatible with high or low level signal Relay outputs: 1. NO: normally open relay interface 2. COM: common relay interface 3. NC: normally closed relay interface Triggering options: Low level trigger when the jumper is connected to the bottom pin. High level trigger when the jumper is connected to the top pin. Package contents: 1 x 1-channel relay module with optocoupler Includes four hole mounting bolts, 3.1mm diameter Dimensions: 50mm x 26mm x 18.5mm (L x W x H) Material: PCB Color: Blue Package includes: 1 x Relay Module Only the above package content; other products are not included. Note: Lighting and different displays may cause slight color variations between the item and the image. Measurement allows an error of +/- 1-3cm.