The 2 channel relay module is more or less the same as a single-channel relay module, but with some extra features like optical isolation. The dual-channel relay module can be used to switch mains-powered loads from the pins of a microcontroller.
The dual-channel relay module contains switching relays and the associated drive circuitry to make it easy to integrate relays into a project powered by a microcontroller. On the left are two terminal blocks, which are used to connect the main wires to the module without soldering.
2 Channel Relay Module price in pakistan