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Last updated October 2026

Third Reality Smart Button ZB2

A compact three-key Zigbee remote with press, double press and hold on every key, charged over Micro-USB, built for Home Assistant and SmartThings.

4.3
742 ratings

#6 Top Rated in Buttons

$29.99
As an Amazon Associate I earn from qualifying purchases
Launch Year: 2026

Model: 3RSB01085Z

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Our review

Third Reality Smart Button ZB2 Review: Three Keys, Nine Actions and a Rechargeable Battery for Your Zigbee Hub

The verdict

The Third Reality Smart Button ZB2 is a small three-key Zigbee remote: each key reports a single press, a double press and a hold, so one device can run up to nine scenes or automations on a Zigbee hub. It works with Home Assistant (ZHA and Zigbee2MQTT) and SmartThings or Aeotec hubs, and a built-in lithium battery recharges over Micro-USB instead of using disposable cells. Apple Home and Google Home need the separate Smart Bridge MZ1, Alexa is not supported, and it sits on a table rather than mounting to a wall, so it suits a Home Assistant or SmartThings home looking for a budget scene remote.

Best for
  • Home Assistant users
  • SmartThings users
  • Multi-scene control
  • Bedside and desk remotes

Pros

  • Three keys, each with press, double press and hold (nine actions)
  • Built-in rechargeable battery, charged over Micro-USB
  • Works with Home Assistant (ZHA and Zigbee2MQTT)
  • Works with SmartThings and Aeotec hubs
  • Beep feedback and a find function that makes it beep
  • Reports battery level and takes OTA firmware updates

Cons

  • Needs a Zigbee hub to work
  • No Alexa support
  • Apple Home and Google Home require the Smart Bridge MZ1
  • No adhesive, magnet or wall plate included
  • No dimming of its own and no direct pairing to bulbs
  • Indoor use only, no IP rating

Who is the Third Reality Smart Button ZB2 for?

It is for homes that already run a Zigbee hub or coordinator and want a physical control for routines that have no wall switch: a goodnight scene by the bed, a leave-home button by the door or a movie mode on the coffee table. The three keys each report three actions, so a single ZB2 can replace several one-key buttons. It switches nothing by itself and needs a hub, such as Home Assistant with ZHA or Zigbee2MQTT, a SmartThings or Aeotec hub, or Homey.

What the Third Reality Smart Button ZB2 offers

Each of the three keys (labelled 1, 2 and 3) sends a press, a double press and a hold, plus a release event in Zigbee2MQTT, for up to nine programmable actions. The battery is built in and recharges through the Micro-USB port with the cable included in the box, so there are no coin cells to replace. A buzzer confirms pairing, a long press and a full charge, and a find function makes it beep ten times so it can be located when it goes missing. It reports its battery level to the hub and takes firmware updates over the air. At 51.6 x 39 x 14 mm it is small enough to carry from room to room.

What to know before you buy

A Zigbee hub is required: the ZB2 does not join Wi-Fi, Bluetooth or Tuya Smart Life apps, and it cannot be paired straight to a bulb. Alexa is not supported. Apple Home and Google Home are only reached through the Third Reality Smart Bridge MZ1, sold separately, which publishes the button to Matter. It confirms presses with beeps rather than a light, has no dimming of its own, and ships with no adhesive pad, magnet or wall plate, so it is a tabletop remote rather than a wall switch. There is no IP rating, and Third Reality gives an operating range of 0 to 45 °C, so it belongs indoors. The power adapter for charging is not included.

Is the Third Reality Smart Button ZB2 worth it?

For a Home Assistant or SmartThings home it packs a lot into a budget-friendly remote: three keys with nine actions, a rechargeable battery and a find-my beeper. Homes built on Alexa should look elsewhere, Apple Home and Google Home users have to budget for the Smart Bridge MZ1, and anyone who wants a button fixed to the wall should pick a model that ships with a mount. Next to Third Reality's original single-key Smart Button, which runs on AAA batteries, the ZB2 trades the wall mount for more keys and a battery that charges.

Frequently asked questions

Does the Third Reality Smart Button ZB2 need a hub?

Yes. It is a Zigbee 3.0 device and needs a Zigbee hub or coordinator, such as Home Assistant with ZHA or Zigbee2MQTT, a SmartThings or Aeotec hub, or Homey. It cannot be paired directly to lights.

How many actions does the Smart Button ZB2 support?

Up to nine. Each of its three keys reports a single press, a double press and a hold, and each can run its own scene or automation on the hub.

How do you charge the Smart Button ZB2?

It has a built-in rechargeable lithium battery that charges through its Micro-USB port with the cable included in the box. The power adapter is not included, and the button beeps five times when it is fully charged.

Does the Smart Button ZB2 work with Alexa, Apple Home or Google Home?

Alexa is not supported. Apple Home and Google Home work only through the Third Reality Smart Bridge MZ1, sold separately, which bridges Third Reality Zigbee devices to Matter.

How is the ZB2 different from the original Third Reality Smart Button?

The original Smart Button has one key and runs on two AAA batteries, while the ZB2 has three keys with nine actions in total and a built-in battery that recharges over Micro-USB.

Can the Smart Button ZB2 be mounted on a wall?

It comes with no adhesive pad, magnet or wall plate: the box holds the button, a Micro-USB cable and a quick start guide, so it is designed to sit on a table or be carried around.

At a glance

Summary

Everything this button supports, grouped by category.

Size & Materials
2 × 1.5 × 0.6 in 51.6 × 39 × 14 mm
Power
Rechargeable Battery
Controls
Buttons (3)Double PressLong Press
Connectivity
Zigbee (Zigbee Hub required)
Integrations
Google Home (Smart Bridge MZ1 required)Apple HomeKit (Smart Bridge MZ1 required)Samsung SmartThingsHome Assistant
Features
Sound FeedbackLow Battery AlertsOTA
Company
Third Reality logo

Third Reality

4.1/ 5 avg ratingChina flagHeadquartered in China

Third Reality, often styled THIRDREALITY, makes affordable Zigbee and Matter smart home accessories such as smart switches, plugs, motion and contact sensors, and night lights. Its devices are popular with SmartThings, Hubitat and Home Assistant users looking for low-cost Zigbee gear. Third Reality focuses on simple, budget-friendly automation building blocks.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Dimensions

2 × 1.5 × 0.6 in 51.6 × 39 × 14 mm

Weight

?

Weather Resistance

NO

Third Reality publishes no IP rating for the ZB2; its manual gives an operating range of 0 to 45 °C.

Available in colors

NO

Power
Battery Type

Lithium polymer

Battery Life

?

Rechargeable Battery

YES

Built-in lithium polymer battery, recharged through the Micro-USB port with the cable included in the box (power adapter not included).

Battery-Free (Kinetic)

NO

Controls
Buttons

3

Rotary Dial

NO

Motion Gestures

NO

Double Press

YES

Long Press

YES

Triple Press or More

NO

Each key reports single press, double press, hold and release only.

Dimming Control

NO

Mounting
Wall Mountable

NO

The box holds the button, a Micro-USB cable and the quick start guide, with no adhesive or bracket: Third Reality presents it as a portable remote to place on a table.

Wall Plate Included

NO

Magnetic Mount

NO

Connectivity
2.4 GHz WiFi

NO

Bluetooth

NO

Z-Wave

NO

Zigbee

Zigbee Hub required

Thread Protocol

NO

Other

NO

Integrations
Google Home

Smart Bridge MZ1 required

Third Reality's Smart Bridge MZ1, sold separately, publishes its Zigbee devices to Matter for Google Home; its firmware 1.01.03 (March 2026) added the Smart Button ZB2.

Alexa

NO

Third Reality lists Home Assistant, SmartThings, Aeotec and Homey for the ZB2 and documents no Echo pairing mode, and Alexa has no device type for Zigbee scene buttons.

Apple HomeKit

Smart Bridge MZ1 required

Reaches Apple Home through Third Reality's Smart Bridge MZ1, sold separately, whose firmware 1.01.03 (March 2026) added the Smart Button ZB2.

Samsung SmartThings

YES

Third Reality lists the SmartThings 2015 and 2018 hubs and the Aeotec Smart Home Hub as compatible.

Home Assistant

YES

Supported in ZHA and Zigbee2MQTT (3RSB01085Z), with single, double, hold and release actions on each of the three keys plus battery level.

Matter

NO

Features
Direct Device Control

NO

A Zigbee hub is required: the button only sends its actions to a hub.

LED Indicator

NO

The manual describes beeps, not a light, for pairing, holds and a full charge.

Sound Feedback

YES

It beeps to confirm pairing, a long press and a full charge, and a FINDMY command makes it emit 10 short beeps to locate it.

Low Battery Alerts

YES

It reports its battery level to the Zigbee hub (Zigbee2MQTT exposes it as a percentage).

OTA

YES

Zigbee2MQTT lists OTA firmware updates for the 3RSB01085Z.

Automations

YES

History Records

?

Required to work

You need a Zigbee hub for this

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Why it needs a Zigbee coordinator

The Third Reality Smart Button ZB2 speaks Zigbee, not Wi-Fi. On its own it cannot reach your phone, your voice assistant or any automation: it needs a Zigbee coordinator to join. These are the ones in our catalog that can run it.

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