door open United Kingdom

...The hands-free system allows you to open any door without having to press a button. Up to 28 doors can be opened independently. When you enter into the activation range of the Free15r/30r/50r antenna with the FreeT/TH tag, the antenna activates the tag which sends a radio signal to the chosen receiver that can reach up to 100 metres. ​ It is very simple to install as radio signals are used, so no wiring is required! The ranges of action of the antennas can go up to 5 metres, depending on the model.

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