Car alarms with antenna module

 

— in this case, we mean a module with an active antenna, which provides a long range of communication between the system and the remote control — up to several kilometers. However most often such a range is available only for transferring data from the system to the key fob; giving commands in the opposite direction requires smaller distances, because It is difficult to equip a keychain with a powerful transmitter. At the same time, in fact, this is not a serious drawback: the need to control the alarm from a distance of several hundred metres rarely occurs, in contrast to the need to receive notifications at the maximum possible distance.