This product is based on the theory that ultrasound (more than 20KHZ) is above the upper limit of human hearing, but within the dog s.
It has the following three functions---
training all kinds of dogs such as that are used as pets, in police and for shepherding;
expelling ferocious dogs effectively and also illuminating.
It can be used as a torch at usual time.
VS-110 use Laminated 9V battery
VS-110B inner 7.4V 250mAH lithium battery