Bought the Sonoff Micro USB Smart Adaptor from Lazada for S$13.99. Shipping is free as I got the free shipping coupon due to Lazada’s year-end sale.
Sonoff Micro USB Smart Adaptor is a no-frill device that allows you to control your USB device remotely. The device connects to your wi-fi network and can be added via the eWeLink app.
Right at the beginning of my smart home journey in 2016, I have been using MCO Z-Wave smart wall switches.
I have used a mix of both Series 3 and Series 4 MCO switches. All my 1-gang switches are Series 4 (MH-S411), and all my 2-gang and 3-gang switches are Series 3 (MH-S312 and MH-S314).