These compact, waterproof (IPX7) and rugged devices have integrated stainless steel contact points optimized for all dog breeds and all coat lengths * For trainers who want to put an end to nuisance barking, the dog devices include our innovative, built-in BarkLimiter, which corrects unwanted barking through advanced bark correction technology. This feature works only with the Delta Sport handheld * The dog devices use long-lasting rechargeable lithium-ion batteries that last 3 months per charge - They are compatible with all Garmin 3/4-Inch collar straps