The Educator Two Dog ET-402TS is medium range trainer loaded with unique features making it the most humane and effective trainer available. It provides the user the ability to adjust the level of each dog separately using our patented “Lock and Set” feature. Don’t be fooled by the small collar receiver size 2”X1.5”X1” 2.4 ounce, it provides plenty of stimulation for most dogs. The unique COS (control of stimulation) technology provides very clean stimulation without the normal head jerking often found with other training collars. The tapping sensation employed is similar to vibration, but more intense making it a good substitute to the stimulation. The stop watch style transmitter is so ergonomic; you don’t even have to look at the remote allowing you to watch your dog. The night tracking light is controlled by the transmitter allowing the user to flash or continuously light up the collar receiver for locating your dog after dark. Lost transmitter beeper can be turned on to help locate a misplaced or lost transmitter. The transmitter even floats so don’t worry if you drop in the lake. Educator Remote E-Collar will turn a smart stubborn dog into a genius. 100% Satisfaction Guaranteed. Proudly Assembled in the USA.