LOVE2PET&reg; Ultrasonic Flea and Tick Shield Our non-replaceable lithium battery will last up to 10 months to provide continuous protection The Love2Pet Ultrasonic Flea & Tick Shield is not affected by rain or moisture so you do not have to worry about your animal being outside Simply attach the Love2Pet Ultrasonic Flea & Tick Shield to your dog or cat's collar with the included "o" ring The Love2Pet Ultrasonic Flea & Tick Shield is effective within an area of 32 square feet