MHCOZY makes straightforward smart home components that don’t ask you to learn a new ecosystem. This 4-channel dry contact relay module is a practical tool for automating things most smart switches can’t touch. It connects to your home’s 2.4GHz Wi-Fi and pairs via Bluetooth for initial setup, then runs through the eWelink app. The key here is the dry contact output. There is no voltage at the terminals. That means you can safely wire it to a garage door opener, a magnetic door lock, or a motorized curtain without worrying about mismatched power.

Each of the four channels supports three independent working modes: inching, self-locking, and interlock. You set these per channel in the app. The inching mode is especially useful for garage doors or gates. You can adjust the pulse duration from half a second up to an hour. The self-locking mode works for lights or appliances you want to toggle on and off. Interlock is handy for shutter controls where only one direction should be active at a time. The relay handles up to 10 amps, and the DIN rail mounting keeps installation tidy inside an electrical panel.

The clamp-style connectors accept solid or stranded wire without needing screw terminals. That speeds up wiring. One honest limitation: the app experience is functional but not polished. You will get it done, but don’t expect Hue-level design. For under $30, this is a capable way to bring older home automation gear into your phone’s control without ripping out existing wiring.