The Kasa Ultra Mini Smart Plug 15A 4-pack is TP-Link’s smaller, slimmer four-pack — the model to buy when a standard HS103 would cover the second socket on a duplex outlet and that gets in the way. Each plug is rated at the same 15A / 1,800W ceiling as the rest of the Kasa Wi-Fi line, supports Alexa and Google Assistant, runs the polished Kasa Smart app, and ships without a hub. At around $40 for four it costs slightly more per plug than the standard HS103P4, with the slim chassis as the practical upgrade — and in older homes and apartments with limited outlet counts, that practical upgrade typically doubles the useful outlets available compared with the chunkier HS103. This Kasa Ultra Mini 4-pack review covers setup, smart features, build, energy considerations and value.
Prime Kasa Smart Plug Ultra Mini 15A, Smart Home Wi-Fi Outlet Works with Alexa, Google Home & IFTTT, No Hub Required, UL Certified, 2.4G WiFi Only, 2 Count (Pack of 1)(EP10P2) , White
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Kasa Ultra Mini 4-Pack at a Glance
| Component | Specification |
|---|---|
| Wattage capacity | 15A / 1,800W at 120V per plug |
| Wireless protocol | Wi-Fi 2.4GHz (no Bluetooth, no 5GHz) |
| Voice assistant support | Alexa, Google Assistant, SmartThings (no HomeKit) |
| Scheduling | Yes, per-plug 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 per plug; 4 plugs in pack; slim chassis |
| Hub required | No — direct Wi-Fi pairing |
| Approx price | around $40 for the 4-pack |
Setup & App Experience
Setup is identical to the rest of the Kasa line and matches the experience that has made the Kasa Smart app the gold standard in this category. Download the app on iOS or Android, plug in the first Ultra Mini, and pair it on the 2.4GHz Wi-Fi band in about a minute. With four plugs in the pack, doing them in sequence takes around five minutes total, after which each can be labelled (“Living Room Floor Lamp,” “Bedside,” “Office,” “Coffee Maker”) and assigned to rooms. The Kasa app is genuinely well designed — clean layout, fast response, no nagging. Linking to Alexa or Google Home is a single skill-link step in the respective app. For first-time buyers and existing Kasa households alike, the experience is smooth, and the four plugs share the same app and account as any other Kasa model already on the network.
Smart Features — Scheduling, Voice, Away Mode
The Ultra Mini supports the full Kasa feature set with no software-level compromises versus the standard HS103. Schedules turn plugs on at sunset and off at bedtime with sunrise and sunset calculated per location. Voice control covers Alexa (“Alexa, turn off floor lamp”) and Google Assistant (“Hey Google, turn on coffee maker”). Scenes group plugs into a single tap or voice command — a “Goodnight” scene that turns off all four plugs is genuinely useful for whole-home rollouts. Away mode randomises lamp on/off over a chosen window to simulate occupancy. SmartThings integration is supported for Samsung households. There is no Apple HomeKit support on the basic Ultra Mini — Apple-first buyers should choose a HomeKit-native plug or the KP125M Mini Energy Monitoring plug which does include HomeKit.
Energy Monitoring & Savings
The Ultra Mini does not include energy monitoring — that lives on Kasa’s energy-monitoring SKUs — so savings here come from scheduling and away-mode automation rather than per-device wattage tracking. For a four-plug rollout the schedule-driven savings are still meaningful: turning four lamps off at bedtime automatically, or shutting a space heater off when the household leaves for work, removes the kinds of small accidental losses that add up across a year. The 15A / 1,800W rating per plug is the standard maximum and matches every other Kasa Wi-Fi plug, so each plug in the pack can handle any single appliance under 1,800W independently.
Build & Reliability
The Ultra Mini chassis is the upgrade here, and it matters in practice. The plug is roughly two-thirds the depth of a standard HS103, and crucially it does not protrude far enough to cover the second socket on a typical duplex outlet — so two Ultra Minis fit on a single outlet with both sockets usable. For a four-plug rollout that doubles your useful outlets compared with the standard HS103P4, which is a real practical win in older homes with limited outlet counts. Build quality is the same TP-Link standard — solid plastic, firm contacts, a single physical button on the side for manual override, and reliable Wi-Fi reconnection. Long-term firmware support is among the best in the category. Pair with a clean monitor setup from our USB-C hub buyer’s guide.
Who It’s For
The Ultra Mini 4-pack is the right pick for buyers in older homes or apartments where outlet counts are limited and the slim profile genuinely matters. If you are planning a four-plug rollout and care about being able to use the second socket on each outlet, the Ultra Mini is worth the small price premium over the standard HS103P4. It is also the right pick for visible installs where the slimmer chassis is less obtrusive. It is not the cheapest per plug — the HS103P4 is — so households that don’t share an outlet between two plugs may not need the upgrade. For Apple Home users this isn’t the right pick either; choose a HomeKit-native plug. For most Alexa or Google households doing a whole-home rollout in space-constrained outlets, this is the upgrade pick.
Verdict
At around $40 for four plugs the Kasa Ultra Mini 4-pack earns a strong recommendation for outlet-constrained households doing a whole-home smart-plug rollout. The slim chassis is a real practical advantage in older homes and apartments where outlet counts are limited, the Kasa app and dual-platform Alexa and Google support are the best in the category, and the value-per-plug remains good even with the small price premium over the standard HS103P4. The lack of HomeKit applies across the Kasa basics — Apple Home users should choose the KP125M Mini Energy Monitoring plug instead, which is the most flexible Kasa plug for mixed-ecosystem households. For Apple-first households, choose differently; for everyone else upgrading from standard HS103s or doing a fresh whole-home rollout where outlets are shared between two plugs, this is the slim 4-pack to pick and the more flexible long-term install. Pair with our best gaming desks guide for visible-install cleanliness and our best RTX 5070 gaming laptops for matching gaming hardware.
Frequently Asked Questions
How much smaller is the Ultra Mini compared to the standard HS103?
The Ultra Mini is roughly two-thirds the depth of the standard HS103, which is enough to leave the second socket on a typical duplex outlet usable — meaning two Ultra Minis fit on one outlet whereas two HS103s would block each other.
Does the Ultra Mini 4-pack support Apple HomeKit?
No. The Ultra Mini supports Alexa, Google Assistant and SmartThings, but not Apple HomeKit. For HomeKit compatibility, choose the Kasa KP125M Mini Energy Monitoring plug instead.
Is the Ultra Mini 15A rating real?
Yes. Despite the smaller chassis, each Ultra Mini is rated at the full 15A / 1,800W ceiling at 120V, so it can handle any single appliance under 1,800W just like the standard HS103.
Do I need a hub for the Ultra Mini 4-pack?
No. Each plug connects directly to your 2.4GHz Wi-Fi network through the Kasa Smart app — no bridge, hub or additional hardware is required.
More Smart Plug Reviews
- Kasa Mini Smart Plug 15A Review: 4-Pack Compact Wi-Fi Plugs
- Kasa Ultra Mini Smart Plug 15A Single Review: 1-Pack Slim Plug
- Kasa Smart Wi-Fi Plug HS105 Review: Slim 12A Wi-Fi Plug
- 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
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