Soundshield, by Max & Molly, safely and effectively protects dogs from fleas & ticks without any harmful chemicals. Using scientifically-backed technology, the device emits ultrasonic sound waves (3ft circumference) that are inaudible to humans and animals but irritate the nervous system of ticks and fleas. Soundshield features an array of upgrades from other ultrasonic tags, including a silicone security strap, waterproof IPX7 submersible, replaceable battery, and blinking indicator light. In addition, unlike competitive products, Soundshield boasts an array of improvements and scientifically backed evidence. Features: *Chemical-free tick & flea protection *Silicone-style strap securely fastens device close to the pet onto collars and harness *Waterproof IPX7 (submersible) *Season-long protection (8 months) *Replaceable battery *Blinking “Active Shield” indicator light *Appropriate for Any Size/Breed Dog, Tag measures 1.5" ** Soundshield does not kill fleas and ticks but rather deters them based on the pet wearing the ultrasonic tag 24/7