Technical specifications


  • Magnetic door/window contact
  • Immediately detects open doors and open/tilted windows
  • Helps save on heating costs when used together with FRITZ! radiator controls
  • Switches and controls all FRITZ! Smart Home devices and compatible Zigbee devices
  • Can be used in scenes, templates and routines
  • Check status in FRITZ!App Smart Home, FRITZ!Fon and FRITZ!OS
  • LED shows standby, updates, registration mode and successful registration
  • Can be used with any FRITZ!Box with a DECT base station (FRITZ!OS 7.50 or later) via DECT ULE
  • Automatic update function for new features
  • Easy to set up and optimized for use in the FRITZ!Box user interface


  • Can be mounted on almost all window and door frames
  • Can be mounted "invisibly" in standard window frames with Eurofold
  • Can be mounted flexibly with the adhesive strips supplied

Device properties

  • Dimensions of sensor (W x H x D): approx. 91 x 24 x 12 mm
  • Dimensions of magnet (W x H x D): approx. 28.5 x 15 x 6.5 mm
  • Weight of sensor: approx. 36 g (with batteries)
  • Weight of magnet: approx. 6 g
  • Battery operation: 2 x AAA batteries
  • Wireless standard: DECT ULE
  • Frequency range: 1880 - 1900 MHz
  • Radio range: up to 40 meters indoors
  • Maximum transmitter power: 250 mW
  • Operational at an ambient temperature of 0°C to 50°C (not in wet or damp rooms)

Package contents

  • FRITZ!DECT 350
  • Quick Guide
  • 2 x AAA batteries
  • Adhesive strips for test mounting
  • Adhesive strips for permanent installation
  • Reset pin


  • FRITZ!Box with DECT base station and FRITZ!OS 7.50 or later

Article number

  • 20003050