Designed for smaller breeds measuring as small as 9.5" in neck circumference. TT 15 mini is lighter in weight (7.5 oz.) compared to the standard TT 15 dog device (10.0 oz.). Allows you to save the battery life on your dog device by turning on the sleep mode feature from the handheld 3/4" collar. The straps Compatible with 3/4" polyurethane-coated nylon collar straps. Featuring top-mounted, high-sensitivity GPS and GLONASS receiver for increased signal reception. Includes 2 lengths (long and short) of removable, stainless steel, insulated contact points for reliable performance in wet conditions and extended comfort for the dog. Dimensions: 1.4" X 3.1" X 1.8".