The original casing for the B&F collar is shit, the plastic is too hard making it too brittle,. They've now changed it for a softer plastic, ive not yet used the newer casing.
Dont agree with the comment about batteries not lasting long, I left the locater box on for over a week by accident, and the battery level was @ 18%!!!! I left the collar on for 5 days and still plenty of life in it. (changed it before using it again though to be safe). & personally I always put decent batteries in.
& a tip for anyone interested, avoid the thought police, there are those that have poo