Tracker's Strike Collar is popular for both coonhounds and pointing dogs. The collar features either a tree or motion sensor, and you can increase the power output of the collar by replacing the standard battery with two half-height 3.6-volt lithium batteries. Other Strike features include: - Magnetic on/off switch - Waterproof - 500 hours of battery life with one 3.6V lithium AA battery - 144 hours of battery life with two half-height 3.6V lithium AA batteries for increased power output - AKC and AFTCA approved for pointing dog field trials. Available in 216MHZ and 217MHZ, in both one and two dog systems.