1/2/4CH WiFi Smart Switch DIY Module 5V-48V eWelink APP Timer Control for Alexa | eBay
TP-Link 8 port Navy blue Ethernet switch | DIY at B&Q
MHCOZY Updated WiFi Wireless Smart Switch Inching Self-Locking Relay Module,Set Inching Time from 0.5 Second to 1 Hour,be Applied to Access Control,DIY WiFi Garage Door Opener (5V): Amazon.com: Tools & Home Improvement