This is a relay module with high performance, which is convenient and practical for users. Module Interface 1. DC #43;: DC power supply positive; 2. DC -: DC power supply module negative; 3. IN: Signal input terminal(support High/Low Level switch freely); 4. Normally open (NO): Relay normally open; 5. Common terminal (COM): Relay common; 6. Normally closed terminal (NC): relay normally closed terminal; Specifications: Type: 4-Channel Relay Voltage: DC 12V Output Capacity: within DC 30V 30A or AC 250V 30A Quiescent Current: 5mA Trigger Current: 5mA Module Size: 128 * 68 * 20mm Module Weight: 177g Package List: 1 * Relay ModuleProduct Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.