IMPI SPC-100 Automatic Dog Bark Control Training Collar With Shock Correction Mode for Small to Xlarge Dogs 7 levels of static pulse correction  including 2 low level reminders. The collar is waterproof. On/off switch  to prolong battery life. A lightweight, comfortable design weighing in at just 47g! EzyFit contacts  simply finger tighten  no tools required! EzyFit black nylon collar is adjustable for all neck sizes up to 24.