Tickless Ultrasonic Repeller PRO-101BL

1.63" overall. Pet version-40KHZ. 94% effective against ticks without chemicals. No odors or fragrances. Device emits ultrasonic pulses that are imperceptible to humans and pets, but interfere with the ability of ticks to orient themselves, thus keeping them away from your pet. Safe for all age pets. Up to 12 month protection. Water resistant. Color: Black. Boxed with hanging tab.