Tip rotates to any position. Clog-free, no ground tip. Tough, flexible shaft up to 90 degrees. High energy, longer lasting alkaline batteries. Durable, reliable solid state electronics system. Transmits very low current to animal with strong, instantaneous jolt. Finger guide to find switch by feel. Rubber switch insulator for prevention of feedback. Precious metal battery contacts won't corrode. Heavy coil spring assures firm battery contact. Tough, structural grade plastic case.