The Otcboimo 30A Smart WiFi Relay Switch handles serious power without breaking a sweat. Rated for 4000W and 30 amps on a 90-250V circuit, this isn’t a dinky smart plug for a desk lamp. It’s built for the heavy stuff: shop lights, garage heaters, or that industrial air mover you keep in the basement. The core appeal here is raw capacity in a compact, installable relay form factor.

Setup runs through the eWelink app, which handles remote on/off control and status tracking reliably. The 2.4GHz WiFi connection is standard, but the included 2.4GHz remote controller with two AAA batteries adds a useful layer of local control. You can toggle a 4000W water heater from bed or from the couch without pulling out your phone. The relay defaults to normally open, so it works as a straightforward on-off switch with no complex logic to configure.

There’s one honest limitation worth noting: this is a plug-in connector type, not a hardwired solution. That makes installation simple for DIY users, but it means you’ll need a compatible socket or enclosure. It also lacks energy monitoring or scheduling, so you’re getting pure remote switching without data tracking. For the price, the 30-amp rating is the standout feature. It handles loads most smart switches can’t touch.