Features: 2-relay channel interface board, which can be controlled directly by a wide range of microcontroller controllers includes AVR, PIC, ARM, PLC, etc. It can control various appliances and other devices with high voltage currentRelay output maximum is AC110V - AC250V 10A and DC30V 10A Standard interface can be directly connected with microcontrollers Red working status indicator for power-on indicationWidely used for all MCU control, industrial sector, programmable logic controller, smart home control Specifications: new Working voltage: 5V Channel: 2 channels Size: 50x3 8mm/1.97x1. 5" Quantity: 1 PcNote: Please allow 1-3mm error due to manual measurement. Pls make sure you do not mind before you make a bid, due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!No retail packagePackage Included:1 x Relay Coupler ModuleFAQ:1. Is there a tracking number for my item? Yes, we ship every order with their tracking number, and you can see the status of the shipment on the corresponding website.2. Is the product the same as the photos? Yes, all photos are real. We took these photos ourselves.3. What size can fit me? We suggest you look at our size suggestion chart below and our product size chart if you have a normal figure. If you have a special figure, please fit in (tell us your height and weight, bust, waist, hip size).4. I am a seller, I would like to buy many pieces of the item, what is the price ? Hi, thank you for your inquiry, if you want to buy large quantity, please send to us, we will give you the best price, thanks!