The EZ 900 Easy Educator is a modern remote trainer-designed with safety in mind. Novel features like maximum stimulation setting and lock and set provide safety from accidental overstimulation of the dog. This medium range trainer is loaded with unique features making it the most humane and effective trainer available. The bar-shaped transmitter on the EZ collar is especially well-suited for easy operation. Its small size allows stealth operation when the situation requires discreetness. Although the EZ 900 is small in size (2" X1.5" X1" 2.4 ounces), it provides plenty of stimulation, even on 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. The boost feature is available to provide boosted stimulation from 1 to 60. The tapping sensation employed is similar to vibration, but more intense making it a good substitute for the stimulation. The night tracking light is controlled by the transmitter allowing the user to flash or continuously light up the collar receiver for locating the dog after dark. The EZ 900 lost transmitter beeper can be turned on to help locate a misplaced or lost transmitter. 100% Satisfaction Guaranteed. Proudly Assembled in the USA.