All items from the HX system are compatible with each other and can be easily added to or expanded. The HX wireless passage detector is an ideal addition to any HX system. This passage detector sends the detected movement as a radio signal to your HX receiver. The detection angle is 360°, but it can also be reduced with a supplied cover. The three-way switch gives you the option to easily turn off the system, only forward the signal to an HX receiver, or let the device vibrate while sending the signal to the HX receiver. Additionally, the passage detector has the ability to distinguish between calls. This means that your HX receiver can identify which transmitter has sent a signal when using multiple transmitters. The HX system features an easy-to-use self-learning function for adding more components. To increase the range, one or more distance extensions can be connected in between. Other transmitters, such as the HX wireless motion detector or HX wireless passage detector, can also be integrated into the system. To avoid interference with other radio transmitters, the HX system offers 256 frequencies that the device learns automatically.