uxcell&reg; DC 3.3-5.5V DS3231 High Precision Real-Time Clock Module for MCU Product Name : Real Time Clock Module;Chip : DS3231 Voltage : DC 3.3-5.5V;Pin Number : 6 Powered By : 1 x 3V CR2032 Battery(Non Included);PCB Size : 3.6 x 2.1cm/1.4" x 0.8"(L*W) Materials : PCB;Main Color : Blue Net Weight : 11g;Package Content : 1 x Real Time Clock Module