The K9-400 K9 Handler is a 3/4 mile range trainer loaded with unique features, making it the most humane and effective remote control K9 trainer available. Although small in size (2"x1.5"x1" & 2.4 ounces) and the world's smallest rechargeable k9 collar, it provides plenty of stimulation for most dogs. The K9 Handler has a unique COS (control of stimulation) technology that provides very clean stimulation without the normal head jerking often found with other training collars. The bungee collar provides added comfort and contact reliability unmatched in the k9 collars industry. The transmitter is able to control a night tracking light and also features a lost transmitter beeper to help locate a misplaced or lost transmitter. The transmitter even floats so don't worry if you drop in the lake or any other body of water. This remote control k9 collar is the perfect solution to your training needs!