The iQ VIBE activates through the Sound Recognition Sensor and provides a vibration that is four times stronger than a cellphone vibration. The sensor distinguishes the dogs bark from the surrounding noises to help eliminate unwanted barking. The iQ VIBE is a rechargeable, ultra-compact receiver that is ergonomically designed with no contact points for dogs 10 pounds and up. Box includes: no bark collar, battery charger and owner's manual. For dogs as small as 10 lbs. Fully waterproof Ultra-compact receiver Non-stimulating pager vibration 2-Hour rapid charge batteries