Extra long range: wireless doorbell with up to 400 m unobstructed range, providing a strong and stable wireless signal to ensure clear sound even when you are several rooms away or on another floor. Wireless bell with bell plate: includes an additional door sign for better visibility. Flashing LED display on the wireless bell and transmitter serves as a visual alert, ideal for individuals with hearing loss or elderly users. Waterproof wireless bell: IP55 rated for dust and water resistance, suitable for outdoor use in harsh weather conditions (-30°C to 70°C). Transmitter features low power consumption and high-quality battery performance. Silent and loud wireless doorbell: plug-and-play receiver offers 55 ringtones and 5 adjustable volume levels, ranging from silent to 110 dB. Built-in memory chip retains your last settings, no need to reset after power interruptions. Expandable doorbell system: supports up to 64,000 learning codes, allowing connection of multiple receivers and transmitters of the same model to expand your system as needed.