Long Range - Operating range up to 1,000ft/300m in an open area with no obstructions allows you to hear the bell and answer the door on time. Waterproof & Dustproof - Waterproof rating guarantees perfect rainy day use. The sleek flat panel makes cleaning dust a piece of cake. Just rest assured to put it outside for convenience. 38 different ringtones and adjustable volume - The doorbell offers you 38 chimes and 3 adjustable levels (can be mute) (0-85db) to meet your needs. needs. Flashing with audio alert indicators, easy to notice by hearing impaired people. Easy to install and use - Easily connect the receiver to an AC outlet (the main receiver does not require a battery) . The transmitter (after installing the battery) can be stuck to the door frame with adhesive tape. Just put the bell where you need it and you are ready to go. Multiple Use - It is suitable for home, apartments, offices, villas and more. You can use our doorbells to train dogs, to calm classrooms, while the