90 Days Full Refund or Replacement: It's a dog doorbells suitable for all size dogs-small, medium or large! It's also can be used as a wireless doorbell for home or as caregiver page for an elderly/sick patient. Our wireless doorbell is approved by FCC and RoHS; Not satisfied with our product? Return it to us within 90 days and get 100% of your money back! | Trigger Simply: This dog doorbells solves the problem of small dog pressing, No need to press, Just touch or slip over the button lightly to activate, easy for any small or big dogs to use and flexibly increase or decrease the receiver and transmitter according to your needs. The matching method is simple and easy to operate. | Powerful Upgrade Reusable Adhesive Tape: Dog Doorbells for potty training without wiring, use Reusable Adhesive Tape to stick it on the door or wall or place anywhere you need. Hook and loop tapes are simple peel off and stick on, sticky backing. Non-slip, Anti-skid. Easy to replace the battery without damaging the wall. | Customizable: Has 55 first polyphonic ring tones and 5 levels of adjustable volume, you can choose the size of your favorite ring tones and ring tones (0-110 decibels), set to doorbell ring. not disturb mode, give users better Home experience. | Long Range & Waterproof: Receiver and transmitter in the barrier-free environment, the maximum effective working distance can reach 950ft. The waterproof grade is IP55, built-in waterproof rubber ring can work normally on rainy days, and can be used indoors and outdoors.