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 Package Package Included:1 x Relay Coupler Module