B59 is a Jammer intended for blocking frequency transmission between a car remote control and its receiver inside the car. Thus, It’s meant to block the remote opening and closing of a car lock.
It is built with 6 different bands, all for radio remote control frequencies and they are:
As you can see, this specific jammer lacks 866 – 869 frequencies. So, when matched with Jammer B55, they can easily block every frequency employed by any car manufacturers.