Repeater / Extender
When longer distances need to be bridged, the wireless repeater/extender can be used. The repeater/extender has a small footprint and can easily be attached to the wall with the related clips. The repeater/extender can connect virtually an unlimited number of sensors and is powered via a standard micro USB connection to a USB charger. The repeater/extender run although also on 2 standard coin cells acting as an UPS (Uninterruptable Power Supply).
Example of a Single Sensor Setup (with optional Repeater)