Feature: 1. Has a wide range of applications, the relay board suits perfectly for being operated by college students, engineers, and technicians and so on. 2. This 1 channel relay module enables 1 way input and 1 way output, and the output parts includes normally closed, common pin and normally open. 3. Ensuring stable working performance with low power consumption as well as high accuracy, also allows for RS485 and TTL communication. 4. Compact size will not take up too much space, together with the light weight, it's very convenient to install the 12V relay board. 5. Made of premium material, has great durability for long term use, and the LED indicator will clearly show the working status. Specification: Item Type: Relay Module Material: Copper Clad Plate Power Supply Voltage: 12v Output Part: NC (normally closed), COM (common pin), NO (normally open). Load: 220V 10A (recommended below 220V 6A) Input Part: IN1 is connected to switch or voltage signal (3V-30V). Hardware Resources: 1. RS485 communication interface; 2. TTL communication interface; 3. 1 input; 4. 1 output; 5. A user LED indicator; 6. A STM32F030F4 microcontroller; 7. 1 relay status indicator LED light; 8. Power terminal interface (12V power supply). . Package List: 1 x Relay Module