The Kasa Outdoor Smart Plug KP400 is TP-Link’s weather-rated outdoor smart plug — IP64-rated against dust and splashing water, with two independently controlled outdoor outlets, Alexa and Google Assistant support, and no hub required. It is the obvious choice for adding scheduled control to outdoor holiday lights, garden lighting, pond pumps or patio appliances, and the dual-outlet design lets you control two outdoor loads independently from a single Wi-Fi plug. At around $25 it is a niche but essential plug for outdoor smart-home setups. This Kasa KP400 outdoor smart plug review covers setup, smart features, weatherproofing, voice control and who should buy.
Prime Kasa Smart Outdoor Smart Plug KP400, Smart Home Wi-Fi Outlet with 2 Sockets, Works with Alexa, Google Home &IFTTT, No Hub Required, Sunset & Sunrise Offset
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Kasa Outdoor Smart Plug KP400 at a Glance
| Component | Specification |
|---|---|
| Wattage capacity | 15A / 1,800W total across both outlets at 120V |
| Wireless protocol | Wi-Fi 2.4GHz (no Bluetooth, no 5GHz) |
| Voice assistant support | Alexa, Google Assistant, SmartThings (no HomeKit) |
| Scheduling | Yes, per-outlet schedules and scenes; sunset/sunrise automation |
| Away mode / Energy monitoring | Away mode included; no per-device energy reporting |
| Outdoor rated | Yes — IP64 dust and splash-water resistant |
| Sockets per device | 2 independently controlled outdoor outlets |
| Hub required | No — direct Wi-Fi pairing |
| Approx price | around $25 |
Setup & App Experience
Setup of the KP400 uses the standard Kasa Smart app flow — install the app, plug the KP400 into a covered outdoor outlet (or pair it indoors first if your outdoor outlet is the only one), and pair to your 2.4GHz Wi-Fi network in about a minute. Pairing indoors first is the recommended approach if you have a weak Wi-Fi signal where the plug will live; once paired, the KP400 remembers your network and will reconnect when relocated. The Kasa app shows the KP400 as a single device with two independently controllable outlets, each of which can be labelled separately — “Holiday Lights” and “Garden Lights,” or “Pond Pump” and “Patio Speaker.” The dual-outlet design is one of the KP400’s standout features: a single Wi-Fi connection controls two outdoor loads independently. Linking to Alexa or Google is a single skill-link step.
Smart Features — Scheduling, Voice, Away Mode
The KP400’s per-outlet scheduling is its most useful feature. Each of the two outlets can have its own schedule — for example, holiday lights on at sunset and off at midnight on one outlet, and garden path lights on a different schedule on the other. Sunset and sunrise are calculated per location, which is the right way to handle outdoor lighting that should track real daylight rather than fixed times. Voice control via Alexa (“Alexa, turn off holiday lights”) and Google Assistant (“Hey Google, turn on garden lights”) works per outlet, so the two loads are voice-controlled independently. Scenes group the two outlets with indoor Kasa plugs — a “Holidays” scene that turns on every set of holiday lights inside and out, for example. Away mode is available on each outlet for occupancy mimicking. No Apple HomeKit support, in line with the Kasa basics.
Energy Monitoring & Savings
The KP400 does not include per-device energy monitoring, so savings come from sunset/sunrise scheduling and off-cycle automation rather than wattage tracking. For outdoor lighting that is exactly the right feature set: the typical issue with outdoor lights is that they are left on past sunrise or left on through the day, and sunset/sunrise scheduling fixes that automatically. The 15A / 1,800W total across both outlets covers most outdoor loads comfortably — a pair of LED holiday-light strings is a fraction of that, and even an electric pond pump and a patio outdoor speaker together stay well under the limit. Be careful with high-draw outdoor appliances like patio heaters, which can exceed 1,800W and should not be plugged into any smart plug.
Build & Reliability
The KP400 is the only weatherproof smart plug in this round-up, and the IP64 rating is what defines it. IP64 means full protection against dust ingress and protection against water splashed from any direction — enough to survive rain on a covered or semi-covered outdoor outlet. It is not rated for direct immersion or for permanent exposure to driving rain, and the manufacturer recommends installing it on a covered outdoor outlet where possible. The chassis is a chunky weatherproof box with rubber gasket covers over each socket; when an outlet is in use, the included cap is removed and the plug-in cable seals against the gasket. The Wi-Fi antenna is tuned for the slightly more challenging outdoor environment — concrete walls and longer distances from typical router locations — and reconnection after router reboots has been reliable in long-term use.
Who It’s For
The KP400 is the right pick for anyone adding scheduled control to outdoor electrical loads — holiday lights, garden lights, pond pumps, patio fans, outdoor speakers or pool-pump timers. The dual-outlet design is more flexible and slightly better value than a single-outlet outdoor smart plug, because two outdoor loads can be controlled independently from a single device and a single Wi-Fi connection. It is not the right pick for indoor use — the indoor Kasa plugs are smaller, cheaper and just as capable. For Apple Home users this isn’t the right outdoor plug — choose a HomeKit-native weatherproof plug instead. For Alexa or Google households with outdoor automation needs, this is the default recommendation. Pair with a smart-home rollout planned with our USB-C hub buyer’s guide.
Verdict
At around $25 the Kasa KP400 outdoor smart plug earns a strong recommendation as the default weatherproof smart plug for Alexa and Google Home households. The IP64 rating is appropriate for a covered or semi-covered outdoor outlet, the dual-outlet design is genuinely more useful than a single-outlet outdoor plug because it controls two outdoor loads independently from one Wi-Fi connection, and per-outlet sunset/sunrise scheduling is exactly the feature outdoor lighting needs across changing seasons. The lack of HomeKit is the standard Kasa-basics gap; for an outdoor HomeKit plug, look at a HomeKit-native weatherproof plug instead. The lack of energy monitoring is the trade-off at this price tier, though outdoor lighting is typically low-draw and per-device wattage tracking is less critical here than indoors. For outdoor smart-plug installs in Alexa and Google households — holiday lights, garden lights, pond pumps, patio fans — this is the easy answer and the dual-outlet design typically replaces what would otherwise be two separate single-outlet outdoor plugs. See also our best gaming desks guide for indoor companion automation and our USB-C hub buyer’s guide for matching smart-home accessories.
Frequently Asked Questions
What does the IP64 rating on the KP400 actually protect against?
IP64 means the plug is fully dust-tight and protected against water splashed from any direction. It is appropriate for a covered or semi-covered outdoor outlet, but it is not rated for direct immersion or for permanent driving rain. Install on a covered outlet where possible.
Can the KP400 control its two outlets independently?
Yes. Each of the two outdoor outlets has its own schedule, voice command and on/off state. You can schedule holiday lights on one outlet and garden lights independently on the other from a single Wi-Fi plug.
Does the KP400 work with Apple HomeKit?
No. The KP400 supports Alexa, Google Assistant and SmartThings, but not HomeKit. For an outdoor HomeKit plug, look at a HomeKit-native outdoor smart plug instead.
Can the KP400 handle a pond pump or patio heater?
A typical pond pump is well within the 15A / 1,800W total budget. Patio heaters frequently exceed 1,800W and should not be plugged into any smart plug — check the heater’s rated wattage before connecting it to the KP400.
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