Kasa Smart KP405 Outdoor Smart Dimmer Plug, IP64

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Product guide

Kasa Smart KP405 Outdoor Smart Dimmer Plug, IP64

Kasa Smart KP405 is an outdoor plug-in dimmer for compatible dimmable lights, with app and voice control over 2.4 GHz Wi-Fi. Its IP64 rating and scheduling suit outdoor string or landscape lighting, but the lights must be dimmable and the load must stay within the listed limits.

At a glance

Adjust brightness remotely with the Kasa app or use Alexa and Google Assistant voice commands.
Schedule lights by time or sunrise and sunset, and group multiple dimmers and string lights in the app.
The listing claims IP64 protection against dust and water splashes, not protection against immersion.
Requires 2.4 GHz Wi-Fi and dimmable lights. The stated maximum is 4 A, with separate listed wattage limits for incandescent and LED/CFL loads.

Price

$15.99Save 30%

Reference price: ~~$22.99~~

Price checked: Nov 12, 2026

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Pros and cons

Pros

Provides dimming as well as app-based on/off control for compatible outdoor lights.
Scheduling and grouping can coordinate outdoor lighting without operating each dimmer separately.
The listing specifies IP64 weather resistance and a claimed open-area Wi-Fi range of up to 300ft.

Cons

Dimming is limited to lights that are themselves dimmable.
The listed load limits are 4 A maximum and 300W incandescent or 150W LED/CFL, so buyers need to match the light type and load.

Technical specifications

14 specifications

Identity
Brand	Kasa Smart
Model	KP405

Dimensions and installation
Dimensions listed	3.15"D x 2.76"W x 1.52"H
Weight listed	5.92 ounces

Materials and protection
Material listed	Polycarbonate (PC)

Electrical and compatibility
Maximum amperage	4 A
Maximum power for incandescent lights	300W Incandescent
Maximum power for LED/CFL lights	150W LED/CFL
Supported Wi-Fi	2.4GHz Wi-Fi only
Claimed open-area Wi-Fi range	up to 300ft

Features and certification
Weather-resistance rating	IP64
Specification met	Etl Certified
Voice assistant compatibility	Alexa or Google Assistant
Warranty listed	2 Years

What to know before buying

Listing details to confirm

Keep the plug at least 8 inches above the ground to reduce rainwater splashback, and cover the socket when it is not in use. IP64 is described as protection from dust and splashes, not immersion. The stated Wi-Fi range is for open areas and actual coverage may differ.

What’s in the box

Included

Plug-in dimmer with 6-inch cable
Clamp
Screw
Quick start guide

Who is it for?

A good fit for

People dimming compatible outdoor string, landscape, holiday, or other dimmable lights from an app or voice assistant.
Buyers with 2.4 GHz Wi-Fi who want schedules, sunrise/sunset automation, or grouped light control.

Less suited to

People whose lights are not dimmable or whose load exceeds the stated limits.
Setups that require Wi-Fi other than 2.4 GHz or a guarantee of the claimed open-area range.

Kasa Smart KP405 Outdoor Smart Dimmer Plug, IP64 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 5,877 ratings

5 stars73%73%
4 stars9%9%
3 stars4%4%
2 stars3%3%
1 star11%11%

Customer feedback includes praise for setup, dimming, app usability, and scheduling, with Christmas tree lights mentioned as one use. Reports on connectivity are mixed, and the feedback also raises concerns about durability and erratic responsiveness. Those mixed experiences matter for a device intended for scheduled or remote lighting, even though the listing describes app control, grouping, and Wi-Fi operation. Value opinions are divided as well.

Positive themes

Customer feedback describes setup as easy and highlights dimming and app usability.
Some customers appreciate setting automatic daily schedules.

Negative themes

The supplied feedback raises durability concerns, including reports of units stopping after a few months.

Mixed feedback

Connectivity feedback ranges from successful Alexa integration to connection problems.
Some feedback describes lights switching on and off unexpectedly, and value opinions are divided.

Frequently asked questions

Can the KP405 dim any outdoor light?

No. The listing says the connected lights must be dimmable. It also lists a maximum of 4 A, with maximum power of 300W for incandescent and 150W for LED/CFL.

Does it work with 5 GHz Wi-Fi?

The supplied product details specify 2.4GHz Wi-Fi only.

Can I control it with voice commands?

The listing names Alexa and Google Assistant compatibility. It also describes control through the Kasa app.

What does IP64 mean for outdoor use?

The listing describes IP64 as protection against dust and splashes of water. It advises placing the plug at least 8 inches above ground and covering the socket when unused.