E-Collar Technologies Pro Educator 900The Pro Educator 900 is a modern e collar designed with safety in mind, novel features like maximum stimulation setting and lock and set protect from accidental overstimulation of the dog. This 1 2 mile range e collar is loaded with unique features making it one of the most humane and effective dog trainer collars around. The PE 900 transmitter is especially well suited for easy operation and is small providing stealth operation when the situation