Các DS1302 DS3231 DS1307 real-time clock module có một thời gian CR2032 pin khi bị mất điện.

Brand.	Wing Alliance.
Color classification.	DS1302 Real-time clock module with battery DS1302 real-time clock module (without battery) DS3231 AT24C32 Clock module With battery (1) DS1307 clock module 24C32 memory with battery (1) DS1302 Clock Module CR1220 Battery Seat Deliver DuPont Line (1) Clock Module DS3231 High-Precision ds3231 Clock Module (1) Rotating LED Display Creative Electronic Clock Module (1)