An excellent, secure device - highly recommended.
The WalkyLock is an ideal solution when you need to leave your dog in the car for a short time. It allows air to circulate more freely around the car (particularly when the passenger windows are slightly open).
The WalkyLock is adjustable to fit all cars, 4x4's etc. Once the car has been locked it is impossible to remove the WalkyLock until opened again.
I personally have found the lock extremely useful with our dog. He has a travel crate in the boot for added security, but he seems much happier when the boot is partially open, but can't get into any mischief!