GreenBlue Wireless Reed Switch / WiFi Door/Window Sensor, Android/iOS, 3.0V DC, LR03x2, with Alarm, GB478, 2 Sets

WIRELESS DOOR AND WINDOW OPENING SENSOR – CONTROL AND PEACE OF MIND EVERY DAY
The GreenBlue GB478 wireless door and window sensor is a practical solution for people who want better control over their home without any complications. Once installed, it notifies you when doors and windows are opened or closed, making it easier to ensure the security of your apartment, house, or office, and to quickly check if everything is locked—even when you’re away from home.
TUYA AND SMART LIFE (ANDROID / IOS) – STATUS, NOTIFICATIONS, AND OPENING TIME IN ONE APP
The device works with the Tuya and Smart Life apps on Android and iOS, making it convenient and intuitive to use. On your phone, you can see the current status of your door or window and enable notifications to help you respond when it matters. Additionally, the sensor allows you to track the duration that the door or window has been open or closed within the app, making it easier to monitor how long it remains in a given state. This solution works well both for everyday use and when you want to monitor your home remotely.

AMAZON ALEXA AND GOOGLE HOME – CONVENIENCE THROUGH VOICE CONTROL
The GB478 sensor is compatible with Amazon Alexa and Google Home, allowing you to enable voice control and use the device as part of a larger smart home system. This lets you quickly check if the door is locked or incorporate the sensor into your home routines without constantly reaching for your phone.
AUDIBLE ALARM – AN ALARM YOU CAN CUSTOMIZE TO THE SITUATION
The built-in audible alert allows the GB478 to function not only as a sensor with app notifications but also as a local on-site warning. You can adjust the alarm volume, and when you need complete discretion, you can turn the sound off entirely. The maximum volume is up to 80 dB, so the alarm is clearly audible and can effectively alert household members or deter unwanted attempts to open the door.
ALARM DURATION ADJUSTMENT: 5–180 SECONDS—JUST AS MUCH AS YOU NEED
The sensor allows you to set the alarm duration between 5 and 180 seconds. This allows you to choose a short alert as a “reminder” (e.g., for a pantry door or a cabinet containing cleaning supplies) or a longer alarm when you want a stronger protective effect.

- Manufacturer: GreenBlue
- Model: GB478 W
- Color: white
- Material: plastic
- Power supply: 2x 1.5 V AAA batteries (not included)
- Standby current: ≤180 µA
- Operating current: ≤70 µA
- Volume level: 80 dB
- Alarm volume adjustment: 0–100%
- Alarm duration adjustment: 5–180 s
- Wi-Fi standard: 2.4 GHz 802.11b/g/n
- Magnetic control distance: ≥15 mm
- Operating temperature: -10°C to +55°C
- Operating humidity: 10%RH–99%RH
- Compatible apps: Tuya, Smart Life (Android / iOS)
- Voice control: Amazon Alexa and Google Home
- Operation indicator: blue LED
- Installation: double-sided tape (included)
- Transmitter dimensions: 58 x 17 x 13 mm
- Receiver dimensions: 92 x 21 x 26 mm
- Applications: doors, windows, cabinets (depending on installation)
- Operating modes: armed / disarmed (manual arming and disarming available)
- App features: status overview, event history, automations/scenes, notifications, arming/disarming schedules

- GreenBlue GB478 Wireless Reed Switch / WiFi Door Sensor - 2 sets
- Double-sided tape
- User manual

MANUAL ARMING AND DISARMING – QUICK CHECK WITHOUT FIDDLING
The GreenBlue GB478 allows for manual arming and disarming, which is convenient when you want to quickly change the sensor’s operating mode on the spot. This is practical, for example, when you’re airing out your home, moving things around, or simply don’t want the sensor to trigger at that moment.
ARMING SCHEDULES – THE SENSOR WORKS WHEN IT’S SUPPOSED TO
An additional advantage is the ability to create schedules that automatically arm and disarm the sensor at specific times. You can set the device to be armed at night, during work hours, or when you’re away, and to operate during the day in a mode tailored to your home’s routine. This is a convenient solution because you don’t have to remember to switch modes—the system will do it for you.
SMART SCENARIOS – A HOME THAT RESPONDS JUST THE WAY YOU WANT
In the TUYA and Smart Life apps, you can create smart scenarios with other devices so that the sensor does more than just report when a door is opened. In practice, this means that a single simple event, such as a door opening, can trigger a scheduled action in your home. This is a very convenient solution because you can tailor the automations to your habits and the time of day, and the whole system runs in the background—discreetly but effectively.

- Detection of doors and windows opening and closing
- Status preview in the app—quickly see whether a specific door or window is currently open or closed
- Event notifications on your phone—useful when you want to know if someone has opened a door, window, or, for example, a cabinet
- Compatibility with Tuya and Smart Life – popular smart home ecosystems, allowing you to easily add and manage devices in one place (Android / iOS)
- Integration with Amazon Alexa and Google Home – the sensors can function as part of your smart home and routines
- Automations and scenes in Tuya/Smart Life – ability to set other devices to react to opening/closing
- Built-in audible alert – with volume control and the option to mute completely
- Maximum alarm volume up to 80 dB – a clear warning signal when you need an immediate response
- Alarm duration adjustable from 5 to 180 seconds – customize the response from a brief warning to a longer alarm
- Manual arming and disarming – quickly switch operating modes, for example, when you’re airing out your home or are at home
- Arm/disarm schedules – sensors can operate automatically according to a schedule (e.g., arming at night or when you leave for work)
- More control when you’re away from home – a convenient solution when you’re at work, traveling, or want to keep an eye on your loved ones’ homes
- Discreet design – a small device that’s unobtrusive and doesn’t detract from the interior’s aesthetics
- Wireless installation – no need to drill into walls or run wires; simply stick it on using the included double-sided tape
- Help with daily organization—practical for families with children (checking on them when they get home), elderly relatives, in the office, or in a small business (monitoring door openings during specific hours)
- Color: white
- The set includes 2 sets