Usage Tips: 1 Transmitter with 2 Receivers. Household loud volume, 7 colors of bright light reminder, long-distance wireless flashing doorbell, suitable for families. Can also call with one button to alert household members. The transmitter and receiver are connected wirelessly, transmitting signal over distance. When the button is pressed, the receiver plays music and flashes seven colors of lights simultaneously, providing visual and audible notification, convenient for nighttime use. Ring the doorbell, the sound is clear and not missed. Volume level 4 is adjustable, audible within 150 square meters. Suitable for large homes, ensuring no visitor goes unnoticed. Low power consumption, energy-saving design. Operates on 7 AA batteries: 3 batteries for each of two receivers, and 1 battery for the transmitter. Battery life lasts 3-5 months. No overheating, safe and reliable for various environments. Functions normally during rain or storm conditions. Easy installation. Doorbell set comes with high-quality double-sided adhesive tape. Simple peel-and-stick setup—no wall damage. Also supports screw mounting for added stability. Secure and firm installation with minimal effort.