Garmin TT 15 Mini Dog Device SMALLER PHYSICAL SIZE - Designed for smaller breeds measuring as small as 9.5" in neck circumference LIGHTER WEIGHT - TT 15 mini is lighter in weight (7.5 oz.) compared to the standard TT 15 dog device (10.0 oz.). COLLAR SLEEP MODE - Allows you to save the battery life on your dog device by turning on the sleep mode feature from the handheld. 3/4" COLLAR STRAPS Compatible with 3/4" polyurethane-coated nylon collar straps; multiple colors sold separately. GPS/GLONASS - Top-mounted, high-sensitivity GPS and GLONASS receiver for increased signal reception. Battery life: 16-30 hours LONG & SHORT CONTACTS - 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.