1. The module uses quality relay normally open interface Maximum load: AC 250V/10A, DC 30V/10A; 2. Adopt SMD optocoupler isolation, strong driving ability and stable performance; trigger current 5mA; 3. The working voltage of the module is 5V; The module can be set to trigger high or low by jumper; 4. Fault-tolerant design, even if the control line is broken, the relay will not operate; 5. Power indicator (green), relay status indicator (red). Humanized interface design, all interfaces can be directly connected to terminal leads, which is very convenient Module interface: 1.DC+: Positive power supply (VCC) 2.DC-: Negative power supply (GND) Relay output: 1.NO: relay normally open interface 2.COM: Common Interface Relay 3.NC: relay normally closed interface High and low level trigger options: It is low-level triggered when the jumper is connected to the low pin It is HIGH triggered when the jumper is connected to the HIGH pin size: 50mm x 26mm x 18.5mm Material: PCB, metal colour: red+blue Package Contents: 10 x Relay module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.