The Mini Educator ET-300TS is a medium range trainer loaded with unique features making it the most humane and effective trainer available. The smaller transmitter is especially well-suited for smaller hands or in situations where discreetness is important. But, don't be fooled by the small receiver size 2"x1.5"x1" 2.4 ounce, it provides plenty of stimulation for most dogs even normal temperament 150 pound dogs. The unique COS (control of stimulation) technology provides very clean stimulation without the normal head jerking often found with other training collars. A booster button is available to provide boosted stimulation from 1 to 60, this allows working levels to be low and when a distraction comes into play a quick reminder of your control is all that is needed. 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, it also helps your dog see in the dog. 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. The mini Educator Remote E-Collar will turn a smart stubborn dog into a genius. 100% Satisfaction Guaranteed. Proudly Assembled in the USA.