No puff needed!!! Fostering collie from RSPCA pending court case re puppy farm. Never seen lanes, fields, roads, anything. NIL skills but learning fast. Voice response slow but comes to this whistle every time.
I have mistakenly, in the past gone for the cheapest so-called replacement, non manufacturer's batteries. and have always been let down by them. Energiser lives up to its' name and I find the price and performance excellent.