Visiglo illuminated dog collars and dog leads feature top quality components. Visiglo design engineers focused on four critical factors when developing the Visiglo line; safety, value, functionality and style. The electronics of the Visiglo dog collar has been engineered to maximise battery life and product brightness. Visiglo dog collars and leads are made from super soft nylon with an extremely high thread count, resulting in durable collars that are more comfortable for dogs to wear and heavy duty leads that are easier for owners to hold. All Visiglo dogs collars share a common low profile power pack and the collar lengths have been sized to standard market sizes. Small collars adjust from 10" - 14", medium collars adjust from 13" - 20" and large collars adjust from 16" - 26". All Visiglo dog leads are the same length of 4ft each. Visiglo collars are powered by high capacity CR 2025 batteries and Visiglo leads are powered by two AA batteries.