Rubetek Knowledge Base



4 in 1 sensor


4 in 1 sensor — wireless device that can significantly expand the capabilities of your system Smart Home. Set up automatic operation of appliances and light sources depending on temperature, humidity, light level or motion. Create scenarios of switching on air conditioner, if it’s too hot, in the morning, if light is off when there is no motion.

Receiver that will transmit commands to other devices of Smart Home and to rubetek Cloud is required for connection of sensor.

Available devices:

Wi-Fi plug RЕ-3305

Wi-Fi single switch relay RЕ-3313

Wi-Fi single switch relay with dry contact RЕ-3314

Wi-Fi double switch relay RЕ-3315

Control module RM-3715

Principle of operation

The sensor monitors the level of light in its field of vision. Light beams are focused by a photoelectric cell and directed to the sensor.

In addition, the device is equipped with a sensitive sensor that detects the slightest changes in temperature and humidity.

The sensor also monitors changes in infrared radiation caused by human movement or activity indoors. When a certain brightness threshold is reached, a temperature change of 1° C, a humidity change of 3% or a motion detection, the sensor sends a radio signal to the receiver, which triggers a previously configured scenario or sends a command to the rubetek Cloud.


Display of sensor readings in application
Two-way communication and display of signal quality with receiver
Push- and SMS- notifications on reaching set values of illuminance level, temperature and humidity changes or motion detection
Push- and SMS- notifications at tampering and at low sensor battery
Diagnostics of sensor functionality every 30 minutes
Display of the name and sensor location room in notification
Lifetime up to 2 years without battery change
illuminance, temperature and humidity change statistics for different periods in application

Structure diagram

  • 1
    LED indicator

  • Battery compartment

  • 1
    Battery fastening
  • 1
    Tampering sensor button
  • 1
    Battery compartment cover

  • Installation

    1. Open cover of battery compartment by picking up the groove and insert the battery (supplied) with the '+' sign upwards. Close the cover.

    1. Install sensor on flat and clean surface by means of double-sided tape, included in the scope of supply. It is important to consider orientation of the device. When locking the position of the sensor, install it so that the groove in the battery compartment cover faces upward:

    Before locking the position of sensor by means of double-sided tape, add it in rubetek application (see Section: Adding to application).

    Detection area

    Optimal installation height: 2-2.5 m

    Installation place within the area of signal receipt by receiver ( see section : Introduction

    Mobile app

    Download and install rubetek application from App Store or Google Play. You can use QR-code.
    Create an account and confirm your mobile number to use the application.

    Adding to application

    1. Open rubetek application.
    2. Add receiver in application, if it was not added before
    3. Press '+' in top right angle of the main screen
    4. Select 'Add Device'

    1. Select section Safety → 4 in 1 sensor RMS-3209

    1. Press and hold button more than 5 sec. to put sensor in adding mode. Diode on front side shall start flashing


    When you add sensor in application, 3 tiles will appear on the main screen: illuminance, temperature, humidity and motion sensor.

    Motion sensor
    Motion detection


    Light sensor
    Current illuminance level



    Temperature and humidity
    Current temperature and humidity level

    Possible sensor conditions:

    Motion sensor
    Motion detected!
    Motion sensor is active. Motion detected

    Motion sensor
    Change battery

    Motion sensor
    Not available
    Sensor is not available 30 minutes or more

    Motion sensor
    Sensor housing tampering


    You can see three statistics for different time periods: illuminance level, temperature and humidity. Schedules are displayed on the main screen.

    Monitor illuminance level in a room during the day. The lack of light can be detrimental to your health.


    You can automate your smart devices by creating scenarios in the rubetek mobile app.

    1. Press '+' in top right angle of the main screen
    2. Select 'Add Automation' from the bottom pop-up menu

    1. Set scenario name so that it is not confused with others
    2. Create conditions of scenario activation: If → Device condition → Motion sensor→ Motion detected
    3. Specify the action that will occur if the condition is met: Then → Device condition → Relay → Switch on

    Create another light source control scenario based on the illuminance sensor values and get a complete solution for saving energy and taking care of your eye health.

    Other opportunities

    Improve your comfort, adding other rubetek devices of 4 in 1 sensor. For instance, using control module RM-3715, you can create autonomous climate control system in your house. Connect module to air conditioner or air humidifier and set the control scenario depending upon temperature and humidity.

    Provide Wi-Fi switch relays RE-3313 or RE-3315 for indoor light sources and create automatic operation scenario depending upon motion or illuminance level.

    Monitor outdoor light sources according to sensor readings. Install it on window frame inside room, connect street lamps to power line using relays RE-3313 or RE-3315 and create their operation scenario depending upon outside illuminance level .

    You can connect home fan to socket RE-3305 to switch it on/off automatically depending upon temperature.


    Press and hold the tile on the screen to open sensor settings.

  • 1
    Sensor name
  • 1
    Location room
  • 1
    Selection of measurement units for light sensor
  • 1
    Notifications settings
  • 1
  • 1
    Hide/display the sensor on the main screen
  • 1
    Add to/remove from Favorites
  • 1
    Battery charge level
  • 1
    Last activity
  • 1
    Event log
  • 1
    Advanced device data
  • 1
    Delete Sensor from the Home app

  • With a one scale division signal, we do not guarantee stable operation of the security system. Move the device to improve signal quality.

    When the battery level is less than 15%, you will be notified to replace the battery.

    The signal transmission power is automatically set uped and directly affects the battery life.

    Event log

    The 'Events' tab displays the chronology of sensor triggering with its name and room location. Also here are messages about low battery power, tampering attempts, and notifications about the triggering of other devices, if any. Tab is in the lower application menu.

    Push notifications

    To use this function you should permit rubetek application to send push notifications. You can do it in your mobile phone settings.


    Why is the battery dead faster than 3 years?
    Battery life is affected by a number of factors: ambient temperature, level of communication with the receiver, and installation location.
    How can I check that sensor is functioning?
    The device communicates with receiver every 30 min. to check functionality. Check the date and time of the last check in the sensor settings (Last Activity).
    Can I set sensitivity level of the sensor?
    No. This parameter is not set uped.
    Can the sensor be installed outdoors?
    No. Sensor is designed for indoor installation
    Where shouldn't the sensor be installed?
    Neal metal objects, causing radio signal attenuation.
    Why don't I get push and SMS-notifications about sensor triggering?
    Check communication level of sensor and receiver. Also make sure that your smartphone settings are enabled to allow notifications from the rubetek mobile app.

    If you can't solve the problem yourself, contact technical support at


    Model RMS-3209
    Connection type RF 868 MHz
    Operation range up to 200 m at open territory
    Sensing element PIR-sensor
    Horizontal viewing angle 110º
    Vertical viewing angle 90º
    Gate threshold up to 12 m
    Measurement limits 0-32767 lux
    Sending data on temperature measurement: ≥ 1ºС
    Sending data on humidity measurement: ≥ 3%
    Operating voltage 3 V
    Power component Battery CR2450
    Battery life-time up to 3 years
    Operating Temperature 0°C…+40°C
    Operating humidity up to 80% (no condensation)
    Installation place interior only
    Mobile app You can't add it directly to the mobile app. Receiver is required (Wi-Fi device, supporting sensor adding function)
    Overall dimensions 45×45×29 mm
    Weight 22 g


    4 in 1 sensor 1 pc
    Battery CR2450 1 pc
    3M tape 1 pc
    Pin 1 pc
    Manual 1 pc
    Warranty card 1 pc