The collar is fully waterproof and has an LED battery life indicator. System includes: No Bark Collar with collar strap, Lithium Polymer battery charger, owner's manual, and plastic dummy contact points. Bark Recognition that distinguishes a dogs barking from its surrounding ambient noises Non-electrical stimulation vibration warning prior to the stimulation 6 intensity levels (2-7) for a wide variety of dispositions Fits dogs as small as 10 lbs (Receiver weight : 4.0 ounces) 2-hour rapid charge Lithium Polymer batteries