First time trying a Collar, and this particular seems to be working. Can NOT go wrong for the $.
I have it on 3 Large dogs, 2 that mainly are Outside (FL) most of the day. We certainly know "fleas" are abundant here and of course ticks. IF it continues as so is, for the collars life span (8) months, WOW
So far SO GOOD, STRONGLY recommend a Try.
Intend on making additional purchase, for future use.