The Relay Module 1 Channel 12V is a compact and reliable switching device that allows low-power circuits like Arduino, PIC, or Raspberry Pi to control high-voltage AC appliances. It features an optocoupler for isolation, indicator LEDs for status display, and screw terminals for easy connections. This relay board is widely used in DIY home automation, smart switch systems, and electronic control projects across Bangladesh. With the ability to handle lights, fans, pumps, and other household appliances, it provides safety, reliability, and flexibility for hobbyists, students, and engineers. Whether you’re building a smart home system or experimenting with microcontroller-based switching, this relay module is an essential tool for any electronics lab.