Every one and all jammers (also known as blockers, scramblers, zappers, etc.) are able to block some specified frequencies and work with limited number of networks and standards. UHF/VHF/LoJack jammers
are not an exception from this rule. The purpose of this type of blockers is to successfully jam ultrahigh and very high frequencies, and LoJack tracking system in addition.
For example: you have installed a GPS jammer in your car or truck, effectively disabling any GPS tracing which could be used towards you. Still you may be at risk of being tracked and even eavesdropped. Thus to be completely sure that you are safe from all kinds of electronic surveillance, you will also need to have UHF/VHF/LoJack jammer to be turned on.
UHF and VHF frequencies are frequencies of walkie-talkies and two-band radio sets, the same as of wireless spy microphones and similar audio recording devices. So blocking them is very important. And the LoJack frequency is a frequency of specifically created tracking system, which can be an alternative to most common GPS, unless it is jammed by your UHF/VHF/LoJack blockers
Considering all things been said before, personal safety and calmness are not so easy things to achieve. But there are technical solutions in a shape of electronic jamming devices which can be used to help you get those peace, calm and lightness in your life which you probably miss. Jammers may be not the ultimate solution for all problems, but they are doing what they are intended to do and they are good at it.
So make a purchase of your choice and strengthen your convenience in your own safety and happiness! And don't forget that there are other types of jammers like WiFi/Bluetooth jammers
which can be very useful in case you need to block all wireless communications.