RECHARGEABLE AND WATER RESISTANT - USES A BURST OF CITRONELLA SPRAY TO HELP DISCOURAGE NUISANCE BARKING AND WHINING. DESIGNED FOR DOGS 8 LBS. AND UP. NO REPLACEMENT BATTERIES. UTILIZES A USB CHARGER. EASY TO REPLACE SPRAY REFILL CARTRIDGES. RESOLVED THE BARKING ISSUE ALMOST IMMEDIATELY SO USED ONLY VERY BRIEFLY. SPRAY DISTRACTS YOUR DOG AND INTERRUPTS THE UNWANTED BEHAVIOR. CDN$129.99 ON AMAZON. GREAT REVIEWS ON LINE