Easy installation Simply plug the doorbell receiver into a socket and install the doorbell push button on the wall or door frame with the supplied adhesive tape. Red LED flashes when someone visits. Installation is simple and requires no knowledge and can be completed in three minutes.5 volume levels and 16 ring tones Depending on personal preference as well as room size and ambient noise level, you can choose your favorite tone from 16 familiar melodies, as well as adjustable volume in 5 levels (0dB-80dB). In addition to the doorbell door, a beautiful LED display also appears, so you know immediately in the noisy workshop or at the party.Long range Up to 300M / 1000FT range outdoors, with 2 radio bell receivers, this radio doorbell kit can be used in apartments, buildings, offices or business premises. With a radio bell, the device can also be used as a care aid for the elderly or patients.IP44 waterproof radio bell outside watertight the housing of the doorbell button is specially designed for outdoor use and is also suitable for all weather conditions. The standard corresponds to IP44 and is therefore protected against splashing water and rain. This guarantees a high level of fluidity.The wireless doorbell has a humanized sleep mode. When someone presses the wireless gong, only the blue LED light flashes and the wireless doorbell turns off without disturbing family members.