Experience reliable long-distance signaling with this waterproof wireless doorbell, transmitting up to 300m in open areas even through walls and doors. Choose from 36 adjustable melodies and 4 volume levels (25dB to 85dB) to suit your preferences. IP44-rated transmitter withstands harsh weather, ideal for outdoor use in temperatures from -30C to 70C. Visual alerts via LED flash cater to hearing-impaired users, enhancing accessibility. Quick setup with plug-and-play receivers (100-260V wide voltage) and versatile mounting options (screws or adhesive). Includes 1 transmitter, 2 receivers, double-sided tape, and screws. Certified by FCC, CE, ROHS, and features an environmentally-friendly 12V23A battery. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.