Remote - When there are no obstacles, the working range in the open area can reach 1000 feet/300 meters, ensuring that you hear the bell and open the door in time. Waterproof and dust-proof - waterproof grade to ensure use in rainy days. The smooth flat plate makes it easy to clean the dust. Please put it outside for convenience. 36 different ringtones and adjustable volume - The doorbell has 36 ringtones and 4 adjustable volumes (0-100 decibels) to meet your needs. The flash lamp with audio alarm indicator is easy to be noticed by people including those with hearing impairment. Easy to install and use - easily plug the receiver into an electrical outlet (the main receiver does not require a battery). The button can be fixed on the door frame with adhesive tape. Just install the doorbell where you need it, and you can go. Multi purpose - suitable for families, apartments, offices, villas, etc. You can use our doorbell to train dogs, use it to quiet the classroom, and the elderly and disabled people use doorbell to help them call pagers! Make sure you don't miss any tourists, you can even hear the sound from the back garden. Product Classic wireless doorbell - fashionable modern design, ingenious and simple, elegant and unique. Good materials can protect themselves from higher temperatures and interference. Package includes: 1 button (transmitter) 1 plug-in buzzer (receiver) 2 screws 1 x double-sided tape 1 * Plug 1 x Screwdriver 1 x User Manual