The Educator ET-400TS is a 3/4 mile range trainer loaded with unique features making it the most humane and effective trainer available with the smallest rechargeable collar receiver in the world. The small receiver size 2”X1.5”X1” 2.4 ounce 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! Proudly Assembled in the USA.