The Dogtra Dog Collar is fully waterproof and suitable for dogs as small as 10 lbs. Dogtra Bark Control Collar: * Designed for medium to large sized dog * Sound recognition and filtering microprocessor * Distinguishes a dog"s barking from surrounding ambient noises * Non-electrical stimulation vibration warning prior to the stimulation * 6 intensity levels (2-7) for a wide variety of dispositions * Rechargeable, 2-hour rapid charge Lithium Polymer battery * Testing level allows for testing of the collar without any electrical correction * Fits dogs as small as 10 lb * Receiver weight: 4.0 oz * Tri-color LED battery life indicator * Fully waterproof * Model# YS500