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A physical button on every plug — what saves you when the network is down

Kasa Smart HS103P4

A four-pack of UL-certified 15-amp smart plugs with a physical button on each, controlled by the Kasa app.

Kasa Smart Wi-Fi plug HS103 in white with side button

Kasa Smart HS103P4

A four-pack of UL-certified 15-amp smart plugs with a physical button on each, controlled by the Kasa app.

Pack
4 plugs
Rating
15 A
Certification
UL certified
Control
Touch actuator on each plug, plus the Kasa app
Voice
Alexa, Echo and Google Home; no hub required
Wi-Fi
2.4 GHz only
App support
Android 5.0 or higher, iOS 10.0 or higher
Automation
Timer and countdown schedules
Matter
Not stated by the maker
Amazon reference
B07RCNB2L3
EAN
0840030702174
  • A physical button on every plug, so a lamp can be switched without a phone or a network
  • UL certified — the strictest named certification on this shelf — and 15 amps published
  • 2.4 GHz only, like six of the eight plugs on this shelf

Best for: Four lamps or fans where a manual override matters as much as the app

≈ $34
Check price on Amazon

Specifications

Pack
4 plugs
Rating
15 A
Certification
UL certified
Control
Touch actuator on each plug, plus the Kasa app
Voice
Alexa, Echo and Google Home; no hub required
Wi-Fi
2.4 GHz only
App support
Android 5.0 or higher, iOS 10.0 or higher
Automation
Timer and countdown schedules
Matter
Not stated by the maker
Amazon reference
B07RCNB2L3
EAN
0840030702174

What the maker puts in writing

  • 4 plugs · 15 A · UL certified
  • Touch actuator on each plug
  • Alexa, Echo and Google Home, no hub required
  • 2.4 GHz Wi-Fi required
  • Android 5.0+ / iOS 10.0+ · timer and countdown schedules

The button is the specification

Six plugs on this shelf are app-only objects. These two have a switch on the side.

When the router reboots, the Wi-Fi password changes or the phone is in another room, that switch is the difference between a lamp and an ornament.

The user count that moves

Over five million here; over four million on the same brand’s two-pack on this shelf, both citing the same award year.

It is marketing rather than specification, and it is worth noting only because it is the kind of number a buyer might otherwise take as fixed.

Availability

Read on the day this page was built: $34 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-04. The live price is at the top of the page.

The questions that keep coming up

Why does a button matter?

Because a smart plug with no button is useless when the network is down or the phone is flat. Both Kasa plugs on this shelf have one; of the other six, none mentions a physical control at all.

Four million users or five?

This listing says over five million and Kasa’s own two-pack on this shelf says over four million, both citing PCMag 2020. The figures are the brand’s own and they disagree; neither is a specification, and nothing else in the two listings differs on the plug itself.

How does it compare with the SONOFF four-pack here?

Same price per plug. This one adds a UL certification and a physical button; the SONOFF adds Matter with HomeKit, surge and lightning protection and a V0 casing. The Kasa publishes its band and the SONOFF does not.

More smart plugs & timers

  • SONOFF Matter smart plug S41s, white square body with status light

    SONOFF S41STPB

    A four-pack of Matter 15-amp plugs with surge and lightning protection in fire-resistant V0 casings.

    Pack
    4 plugs
    Rating
    15 A, 1,800 W
    Protocol
    Matter
    Ecosystems
    Alexa, Google Home, Apple HomeKit, SmartThings
    Protection
    Built-in surge and lightning protection
    Material
    Fire-resistant V0 PC
    Certification
    ETL
    Automation
    Timers and schedules
    Wi-Fi band
    Not stated by the maker
    Amazon reference
    B0FSZS357P
    EAN
    6920075743838
    • The only plug on this shelf with surge and lightning protection, and the only one that names a flame rating for its casing
    • Matter with HomeKit named, across four ecosystems, at seven and a half dollars a plug
    • Does not state which Wi-Fi band it uses, where six plugs on this shelf do

    Best for: A household on HomeKit, or anywhere the mains is unreliable enough that surge protection is worth having

    ≈ $30
    Check price on Amazon
  • SwitchBot Plug Mini smart plug with power monitoring

    SwitchBot Plug Mini

    SwitchBot's Plug Mini adds app scheduling, voice control and live power monitoring to any 16A-rated appliance on this site, including the ones without their own app connectivity — most of the fans, heaters and evaporative coolers reviewed here. Confirmed with a live offer on Amazon.de; we found the same listing on Amazon.fr and Amazon.it but did not confirm live offers there at the time of checking.

    Rating
    16A, Type F (Schuko)
    Connectivity
    Wi-Fi, Matter-compatible; Alexa, Google Home, Apple Home, Home Assistant
    Monitoring
    Live power/energy consumption readout in the app
    EAN
    0810150544350
    • Confirmed with a live offer on Amazon.de at a genuinely low price
    • Power monitoring turns any plugged-in appliance into one you can track energy use for, useful alongside this site's running-cost guides
    • We found matching listings on Amazon.fr and Amazon.it but did not confirm live offers there at the time of checking

    Best for: Anyone who wants to schedule or track the power draw of a fan, heater, or humidifier that doesn't have its own app, without buying a new appliance to get that feature.

    Search Amazon for this model
  • TP-Link Tapo P110 smart plug with energy monitoring

    TP-Link Tapo P110

    TP-Link's Tapo P110 pairs the same core feature set as the SwitchBot plug in this family — scheduling, remote control, energy monitoring — with a notably deeper, more established market: 13 or more active sellers on Amazon.de at the time of checking, well above most single-seller accessories on this site.

    Rating
    16A, 3680W, Type F (Schuko)
    Connectivity
    Wi-Fi, Tapo app; works with Alexa and Google Home
    Monitoring
    Live and historical energy consumption in the app
    EAN
    4897098682432 (identical on DE/FR/IT)
    • The deepest, most established market of any accessory checked on this site — 13 or more sellers on Amazon.de
    • 3680W rating gives meaningful headroom above every heater reviewed on this site
    • We confirmed FR and IT catalog listings by EAN but did not verify a live offer and current price on those two markets

    Best for: Anyone who wants the smart-plug feature set from a widely stocked, well-established brand rather than a single-seller listing.

    ≈ $63
    Check price on Amazon

Elsewhere in the spares drawer

  • Reed 8706 digital psychrometer and thermo-hygrometer with dual-line LCD

    Reed 8706

    A digital psychrometer displaying humidity, temperature and dew point or wet bulb together, with Max/Min/Avg and data hold.

    Displays
    %RH, temperature and dew point or wet bulb, simultaneously
    Readings
    Max, Min and Average
    Data hold
    Yes
    External probe
    Optional 87P6, for contact and differential temperature
    Units
    User-selectable °F / °C
    Power
    Batteries; low-battery indicator and auto shut-off
    Stated uses
    Environmental studies, food distribution, HVAC/R installation, greenhouses, industrial spaces, saunas, humidors, museums, lab monitoring
    Accuracy
    Not stated by the maker
    Range
    Not stated by the maker
    Amazon reference
    B0C6BJ612L
    EAN
    0800837000057
    • Shows humidity, temperature and dew point or wet bulb on screen at the same time — the only instrument on this shelf that does
    • An optional external probe for contact and differential temperature, which no other device here offers
    • No accuracy and no measurement range published anywhere in the listing

    Best for: HVAC work, a humidor, a museum case or a greenhouse, where dew point matters and the reading has to be recorded by hand

    ≈ $125
    Check price on Amazon
  • TempPro TempAir digital hygrometer and indoor thermometer with wide LCD display

    TempPro TP53

    A digital hygrometer accurate to ±2 °F with all-time and 24-hour high and low records and a touch-activated backlight.

    Temperature accuracy
    ±2.0 °F (±1.1 °C)
    Humidity accuracy
    ±2 to 3% RH
    Refresh
    Every 10 seconds
    Records
    All-time and 24-hour high and low, stored and displayed
    Comfort indicator
    Yes
    Backlight
    Touch-activated, via a button below the display
    Mounting
    Holder, hanging hole and magnetic back
    Range
    Not stated by the maker
    Logging
    High and low only — no curve or export
    Amazon reference
    B079N98K93
    EAN
    6971604200285
    • The only device on this shelf that keeps high and low records — both 24-hour and all-time — without needing an app
    • Publishes both tolerances, with the humidity figure tighter than two cheaper devices here
    • A ten-second refresh, the slowest of the three published on this shelf

    Best for: A nursery, cellar or greenhouse where the overnight low matters more than the live reading

    ≈ $16
    Check price on Amazon
  • TFA Dostmann analog thermometer and hygrometer with metal ring bezel

    TFA 45.2024

    A German-made analog thermo-hygrometer with a metal ring, publishing the optimal indoor ranges it is read against.

    Type
    Analog — no batteries
    Case
    Metal ring
    Origin
    Completely made in Germany
    Comfort zones
    Marked on the dial
    Stated targets
    Optimal temperature 18–22 °C (64 to 72 °F); optimum humidity 40–60%
    Mounting
    For hanging, indoors only — house, basement or garage
    Temperature accuracy
    Not stated by the maker
    Humidity accuracy
    Not stated by the maker
    Amazon reference
    B0044XII3A
    EAN
    4009816020284
    • The only listing on this shelf that publishes the target ranges — 18 to 22 °C (64 to 72 °F) and 40 to 60% RH — so the reading means something without looking it up
    • A metal ring rather than a plastic bezel, and German manufacture, both stated
    • No accuracy figure for either measurement

    Best for: A hallway or a cellar wall, for someone who wants the comfort band marked rather than calculated

    ≈ $37
    Check price on Amazon

All smart plugs & timers