Kasa Smart Wi-Fi Plug KP400 (Outdoor, 2 Sockets) Review

What the Kasa KP400 actually is

The KP400 is an outdoor smart plug from TP-Link's Kasa line, and the headline feature is two independently controlled sockets crammed into one weatherproof housing. That means you can run patio string lights on one outlet and a fountain pump or inflatable Halloween decoration on the other, switching each on its own schedule. It plugs straight into a standard outdoor receptacle.

It connects over 2.4GHz Wi-Fi, no hub required, which is the main reason it outsells fussier alternatives. You get an IP64 weather rating, so it shrugs off rain and sprinkler spray but should not be sitting in a puddle. For the $20 to $30 it usually runs at Amazon, getting two smart outlets instead of one is the whole pitch, and it's a good one.

How it performs day to day

The Kasa app is genuinely one of the better ones in the budget smart-home space. Setup is quick, schedules and sunset/sunrise triggers work reliably, and owners overwhelmingly report it just stays connected, which is not something you can say about every cheap Wi-Fi plug. You can also group it with other Kasa gear and run scenes.

Voice control covers Alexa and Google Assistant, both well supported. The big asterisk is HomeKit. There's no native Apple Home support, so iPhone owners deep in that ecosystem will need a workaround or a different brand. The two outlets show up as separate devices in the app, which is exactly what you want for string lights on one timer and, say, a bug zapper on another.

Range can be the weak point. This is a 2.4GHz device sitting outside, often at the far edge of your house, so if your router is buried in a closet across the building, expect to add a mesh node or extender. That's a Wi-Fi physics problem, not a Kasa defect, but it bites people who don't plan for it.

The good and the annoying

Pros: two independent outlets, no hub, a reliable app, solid scheduling, and a price that undercuts most single-outlet outdoor smart plugs. The weatherproofing holds up to normal outdoor exposure, and energy monitoring on supported scenarios is a nice touch for anyone curious about what their lights actually cost to run.

Annoyances: it's a chunky brick, so if your outdoor receptacle has two outlets, the KP400 may block the second one. No HomeKit. And it's 2.4GHz only, which is fine for a plug but contributes to the range complaints. None of these are dealbreakers, they're just the honest tradeoffs at this price.

Who should buy it and who should skip

Buy it if you want set-and-forget outdoor lighting. Holiday string lights, landscape lights, a porch lamp, a pond pump, anything you'd otherwise babysit with a mechanical timer. The two-socket design makes it our default recommendation for anyone running more than one outdoor device, since it's cheaper than buying two single plugs.

Skip it if you're an Apple Home household that wants everything in one app, or if your only outdoor outlet is a long way from the router with no mesh coverage. Heavy-duty loads are also out of scope. Check the wattage rating before plugging in space heaters or anything power-hungry.

The verdict

The Kasa KP400 is the easy pick for cheap, dependable outdoor automation. It does the boring job of switching your patio gear on a schedule without dropping off Wi-Fi every other week, and the dual outlets give it real value over single-socket rivals. Get your Wi-Fi range sorted, accept the lack of HomeKit, and it's hard to spend this little for this much convenience.

Frequently asked questions

Does the Kasa KP400 work with HomeKit?

No. The KP400 supports Alexa and Google Assistant through the Kasa app, but it does not offer native Apple HomeKit support. Apple-centric users will need a different brand or a workaround.

Is the Kasa KP400 weatherproof enough to leave outside year-round?

Yes. It carries an IP64 rating, so it handles rain, snow, and sprinkler spray fine. Just don't submerge it or let it sit in standing water, and keep the unused outlet flap closed.

Can the two outlets be controlled separately?

Yes. Each socket shows up as its own device in the Kasa app, so you can put string lights on a sunset schedule and run a pump or decoration on a completely different timer.