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The transmitter is self-powered and requires no battery replacement, reducing the burden of daily use; the fully waterproof unit withstands outdoor wind, rain and humidity, extending the service life of the device and adapting to multi-scenario installation needs; it adopts a no-drilling, no-wiring design with extremely simple installation steps, allowing the elderly to complete the installation independently without troubling their children; equipped with 433MHz wireless transmission technology, it delivers zero signal attenuation through walls and floors, realizes full-home signal coverage, and avoids missed visitor reminders. The receiver features a variety of ringtones and adjustable volume, with loud yet non-irritating sound that adapts to the different hearing conditions and usage preferences of the elderly; the receiver is equipped with multi-mode high-brightness lights that are eye-catching and clear, realizing dual sound and light reminders to solve the usage difficulties of the elderly, such as missed reminders due to hearing loss and poor eyesight.