The Kasa Smart Wi-Fi Plug HS105 is TP-Link’s original slim smart plug — the model that established Kasa as the default Alexa-and-Google smart plug, before the 15A Mini and Ultra Mini lines arrived to refine the design. It pairs to 2.4GHz Wi-Fi without a hub, runs the polished Kasa Smart app, supports Alexa and Google Assistant, and slim-fits on a duplex outlet without blocking the second socket. At around $15 for a single plug it remains a sensible pick for adding one slim Wi-Fi plug to a household, especially where the slightly lower 12A rating is plenty for the intended appliance such as a lamp, a fan or a small electronic. Years of platform refinement mean the HS105 is one of the most reliable smart plugs on the market for its price tier, with dependable Wi-Fi reconnection after router reboots and consistent firmware updates that no third-party budget plug can match over the long term. This Kasa HS105 review covers setup, smart features, build, energy considerations and value, and explains where the HS105 still makes sense in a 2026 lineup that includes both the newer 15A Mini and Ultra Mini plugs.
Prime Kasa Smart Plug Ultra Mini 15A, Smart Home Wi-Fi Outlet Works with Alexa, Google Home, No Hub Required, UL Certified, 2.4G WiFi Only, 1-Pack(EP10), White
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Kasa HS105 at a Glance
| Component | Specification |
|---|---|
| Wattage capacity | 12A / 1,440W at 120V |
| Wireless protocol | Wi-Fi 2.4GHz (no Bluetooth, no 5GHz) |
| Voice assistant support | Alexa, Google Assistant, SmartThings (no HomeKit) |
| Scheduling | Yes, schedules, scenes and Away mode in Kasa app |
| Away mode / Energy monitoring | Away mode included; no per-device energy reporting |
| Outdoor rated | No — indoor use only |
| Sockets per device | 1 socket; slim chassis fits duplex outlet |
| Hub required | No — direct Wi-Fi pairing |
| Approx price | around $15 |
Setup & App Experience
The HS105 was one of the first plugs to ship in the Kasa Smart app’s modern setup flow, and the experience has been refined over years of TP-Link development. Install the free Kasa Smart app, plug the HS105 into a wall outlet, and the app pairs to your 2.4GHz Wi-Fi in about a minute. Labelling, room assignment and linking to Alexa or Google Home follow the standard Kasa procedure. The HS105 shares the same app and account as every other Kasa plug, so adding it to an existing household alongside HS103, Mini, Ultra Mini or KP125M models is straightforward. The Kasa app remains the polish leader in this category — clean layout, fast response, dependable. For a single slim plug, the setup experience is exactly what the category needs.
Smart Features — Scheduling, Voice, Away Mode
Functionally the HS105 supports the standard Kasa basics feature set. Per-plug schedules cover fixed times and sunset/sunrise per location. Voice commands work via Alexa (“Alexa, turn off slim plug”) and Google Assistant. Away mode randomises lamp on/off to mimic occupancy. SmartThings integration is supported. Scenes group multiple plugs together. The HS105 was the model that established many of these features as Kasa table stakes, and the experience holds up well. There is no Apple HomeKit support — that is the consistent gap across the Kasa basics. For households built around Alexa or Google, the HS105 covers the full set of useful smart-plug features without compromise.
Energy Monitoring & Savings
The HS105 does not include energy monitoring, in line with the rest of the Kasa basics. The savings come from scheduling rather than wattage tracking — automatic off-cycles on lamps, fans and small appliances. The 12A / 1,440W rating is slightly lower than the 15A / 1,800W of the newer Mini lines, which is the main spec difference: most household appliances are well under 1,440W, but the HS105 should not be used for a 1,500W space heater. Lamps, fans, gaming-PC monitors, charger banks, coffee makers and most small kitchen appliances are all comfortably within the 12A limit. For high-draw appliances, choose a 15A Kasa Mini or Ultra Mini instead.
Build & Reliability
The HS105 was the first slim Kasa plug, and the chassis still holds up well. It is slim enough that it does not cover the second socket on a duplex outlet, which was a meaningful improvement over the original chunkier Kasa models. Build quality is the standard TP-Link Kasa level — firm contacts, solid plastic, a small physical button on the side for manual override, and dependable Wi-Fi reconnection after router reboots. Long-term firmware support has been the best in the category for years, and the HS105 has benefited from that consistent post-launch support. For a single-plug install on a regularly used outlet, the build is more than sufficient.
Who It’s For
The HS105 is the right pick for buyers who want a single slim Wi-Fi smart plug at a low entry price and don’t need the higher 15A rating. Typical installs are a lamp, a fan, a gaming-monitor power group, or a coffee maker. The slim chassis means it fits comfortably on a duplex outlet without blocking the second socket. It is not the right pick if the intended appliance draws more than 1,440W — choose a 15A Mini or Ultra Mini instead. For households already on Kasa adding a single slim plug to a new outlet, the HS105 remains a sensible choice at around $15. Pair with a desk refresh from our best gaming desks guide for a tidy install.
Verdict
At around $15 the Kasa HS105 earns a recommendation as a sensible single-plug slim option, particularly for buyers replacing an older non-smart outlet on a lamp or small appliance. The 12A rating is lower than the newer Mini line but is plenty for most household appliances, and the Kasa app and dual-platform Alexa and Google support remain best-in-class. The lack of HomeKit applies across the Kasa basics, and as with the rest of the line the absence of energy monitoring is the standard trade-off at this price tier. For a single slim plug at a low entry price, this is the original Kasa slim plug and it remains a solid, well-supported choice for adding voice control and scheduling to one lamp or small appliance in an Alexa or Google household. Buyers planning a four-plug rollout should step up to the Kasa HS103P4 or Ultra Mini 4-pack for better value per plug, but for a single-outlet install on a lamp, fan or coffee maker, the HS105 remains a sensible long-term choice with the best long-term firmware support in the category. See also our USB-C hub buyer’s guide for matching desk accessories and our best RTX 5070 gaming laptops for a clean gaming-laptop power setup.
Frequently Asked Questions
What is the difference between the HS105 and the Kasa Ultra Mini?
The Ultra Mini is rated at 15A / 1,800W while the HS105 is rated at 12A / 1,440W. The Ultra Mini is the newer model and the higher-capacity choice; the HS105 is fine for any appliance under 1,440W.
Does the HS105 work with Apple HomeKit?
No. The HS105 supports Alexa, Google Assistant and SmartThings, but not HomeKit. For HomeKit, choose the Kasa KP125M Mini Energy Monitoring plug.
Can the HS105 handle a 1,500W space heater?
No. A 1,500W space heater is above the HS105’s 12A / 1,440W rating. For a space heater, choose a 15A-rated plug such as the Kasa Mini or Ultra Mini.
Is the HS105 still supported by Kasa?
Yes. TP-Link continues to support the HS105 with firmware updates through the Kasa Smart app, and the plug remains compatible with current Alexa, Google Assistant and SmartThings integrations.
More Smart Plug Reviews
- Kasa Outdoor Smart Plug KP400 Review: 2-Socket Weatherproof Plug
- Mifaso Outlet Extender Review: 6-Outlet Surge Protector + USB
- Kasa Smart Plug Mini Energy Monitoring Review (KP125M)
- HBN Smart Plug 15A Review: Wi-Fi + Bluetooth Dual Plug
- HBN Smart Plug Mini 15A Review: Compact Wi-Fi Smart Plug
- Amazon Smart Plug Review: The Easiest Alexa Smart Plug
- Kasa Smart Plug HS103P4 Review: 4-Pack Alexa & Google Plugs
- Kasa Smart Plug HS103P2 Review: 2-Pack Alexa & Google Plugs
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