What is the introduction about the chime of the Xiaomi Smart Doorbell 3S?

For your reference, here is the information regarding the chime:
1. The chime is powered by a Type-C power cable. Please use an adapter with safety-certified of 5V/1A to power the chime. The most appropriate working power is 2W;
2. There are 4 built-in ringtones in the chime, and the custom ringtones are not available. However, you can adjust the volume;
3. The Xiaomi Smart Doorbell 3S can connect with up to 4 chimes;
4. The 433MHz connection is used between the chime and the doorbell, which can reach 100 meters without interference and obstruction. Actual conditions will vary depending on the layout of your home.