K9-400 K9 Handler 1.2 km Collar Remote Trainer - DeluxThe K9 400 K9 Handler is a 3 4 mile (1200 m) range trainer loaded with unique features, making it the most humane and effective remote control K9 trainer available. Although small in size (2"x1. 5"x1" & 2. 4 ounces 680 gms) and the world's smallest rechargeable k9 collar, it provides plenty of stimulation for most dogs. The K9 Handler has a unique COS (control of stimulation) technology that provides very clean stimulation without the normal head