Flashing color: This product features 7 flashing colors that can be adjusted according to personal preferences and specific occasions to enhance the decorative effect of the doorbell. Music selection: Built-in multiple music options allow users to customize their preferred chime to create a welcoming home atmosphere. Wireless design: The doorbell has a wireless setup, eliminating the need for complex wiring, making installation quick, easy, and hassle-free. Suitable for elderly and hearing-impaired: With a loud volume output and integrated light flashing function, this doorbell ensures that elderly individuals and those with hearing difficulties can easily notice visitors through both sound and visual cues. Practicality: In addition to use as a doorbell, this product can serve as a call button for children or elderly individuals with special needs to alert family members or caregivers. Power requirements: Operating voltage: DC 4.5V (requires 3 batteries), operating current: less than 200mA. Encoding method: Fixed code. Chimes: 28 selectable melodies. Volume: Adjustable across 8 levels, ranging from 0dB to 85dB. Transmission range: Over 100 meters. Dimensions: Button: 8 x 5 x 2.2 cm; Receiver: 10.2 x 6.7 x 3.0 cm.