Tickless Classic Pet – Easy to use easy to love Ultrasonic tick and flea repellent for cats, dogs, and other lovable furry animals.  (For small-sized pets we designed the Tickless Mini Dog & Cat device which is smaller and means a great fit for them.) Environmentally friendly contains no chemicals or fragrances.   By fastening the easy-to-use, tiny device onto your cat's or dog’s collar, parasites can be kept away for at least 6 months after activation, leaving you and your pet free to enjoy nature. Due to the latest field study, we can conclude that the device is 94% efficient against ticks without using any dangerous chemicals! It is non-toxic and does not use or release any chemical substances or odors, making it safe to use even for young, elderly, ill or pregnant pets.