Petrainer Anti Bark Dog Collar Training System, Electric No Bark Shock Control with 7 Adjustable Sensitivity Control Humane, cost-effective and harmless to your dog. Generally recommend for small/medium dogs Specification-Collar: Length: 2.67 Two training modes: beeper and static shock. Electronic Anti-Bark Dog Collar and Sends harmless warning sound and shock to the dog whenever it barks. Delivers increasingly louder warning tones and shock corrections of 7 levels Sensitivity is user-adjustable according to your dog's barking and specific environments. Voice recognition minimizes false triggering Package Includes: 1 x collar; 1 x Belt; 1 x 6 volt alkaline battery; 2 sets of probes (long and short); 1 x User Manual