“The Whadda 4 channel relay module is nicely laid out and simple to wire up. Worked perfectly with my Raspberry Pi 3B+ for switching on the 12 volt siren for my home alarm system. Nice to know that it could switch up to 10 amps at 250 VAC if I needed it, but I only needed an amp or so at 12 volts for this application. They also included mounting holes on the board, which I needed for this project. Hard to beat the price for this level of convenience. Well done!”
