Flashing color: This product has 7 flashing colors, which can be adjusted according to personal preferences and specific occasions to add decorative effects to the doorbell.Music selection: Built-in multiple music options, users can adjust according to their preferences to create a warm family atmosphere.Wireless design: No complicated wiring is required, the doorbell adopts a wireless design, which is convenient and fast, and no tedious installation steps are required. Suitable for the elderly and the hearing-impaired: The doorbell has a loud volume and is equipped with a light flashing function. The elderly and the hearing-impaired can directly notice the sound and light effects of the doorbell, which is very convenient.Practicality: In addition to being used as a doorbell, this product can also be used as a server for young and elderly people with special needs to call family members or caregivers by pressing a button.Without dry cell batteries: Working voltage: DC4, 5V (3 batteries) Working current: less than 200mA Coding method: power supply Songs: 28 lines Volume: 0dB~85dB [8 levels adjustable)Receiving distance: more than 100M Size: Button 8*5*2.2cm/Part 10.2*6, 7*3.0cmProduct Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.