Deluxe Little Dog Bark Control Collar, From PetSafe

PetSafe Deluxe Little Dog Bark Control Collar Inhibits nuisance barking with self adjusting correction with nano technology to make it the smallest bark collar currently available. For dogs up to 55 lbs. Nano Technology - the smallest bark collar available Patented Perfect Bark technology ensures your dog's bark is the only sound that will cause the correction Automatic Correction Level adjustment called Temperament Learning Ten levels of Light-Touch correction Buckle provides a quick release and perfect fit every time (patent pending) Durable, waterproof Receiver Collar Two color LED for good/low battery indicators Lifetime Limited Warranty