E-Collar EZ-900 Easy Educator 1/2 Mile Remote Dog TrainerThe 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