Both but I think the security part has been answered
It has a lot of nice features depending on what you want. Features no other devices provide. I have one and it's one of my favorite purchases for my truck.
Brake hold: similar to hill start assist other vehicles offer but more. When you come to a stop, apply heavy pressure to pedal for a few seconds. And/brake lights will flash on dash. You can then remove your foot from the brake pedal and you will not move until you press the gas pedal to go again.
Can be set to pulse the third brake light when braking. You can choose the number of flashes and speed of flashes. Helps alert drivers behind you that you are braking. I've had people following me on group cruises comment about how much they liked that feature
Light show allows you to turn the lights on for show purposes. Can program your own custom pattern, or choose one of the preloaded one. Also has option to enable light show in motion so you can use it during parades. Illegal to drive in the road with them on any other time
Allows you to completely disable traction control and stability control if you want to play around doing donuts.
Has a line lock feature for burnouts ( I run my truck at drag strip)
Turn cam turns on the rear view camera when turning.
Park cam turns on the backup camera when the parking sensors sense an obstacle. I use it for parking in my garage so I can make sure I'm in sr enough for garage door to clear since I have inches to spare
Autofold mirrors. Will automatically fold mirrors when you turn truck off, and unfold when you start the truck.
Has 0-30 and 0-60 timers.
Lots of other features I haven't mentioned.