Extra long range: wireless doorbell with up to 400 m unobstructed range, providing a strong and stable wireless signal to ensure clear sound even from 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 the elderly. Waterproof design: IP55 dust and waterproof rating for reliable outdoor use in various weather conditions, operating temperature from -30°C to 70°C. Transmitter features low power consumption and high-quality battery performance. Silent and loud options: plug-and-play receiver offers 55 ringtones and 5 adjustable volume levels, ranging from silent to 110 dB. Built-in memory chip retains the last setting, no need to reset after power interruption. Expandable system: supports up to 64,000 learning codes, allowing connection of multiple receivers and transmitters of the same model to expand coverage as needed.