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) Smaller and lighter than earlier models but still as effective and reliable as any on the market. Provides very gentle but persuasive control of excessive barking, and can be worn by even the smallest of dogs. Has a bark odometer that tells you how many times the dog barked since the collar was turned on. Features 5 levels of stimulation that can be changed at the press of a button. Operates on a single, long-lasting lithium battery (battery life is approximately 14 months). The new “sleep mode” turns the unit off completely when not in use. The strap adjusts easily for a perfect fit. Easy to see light confirms on/off intensity level and low battery. Includes extra set of contact points for thicker haired dogs. Waterproof.