Brand N/A Model DS3231 Quantity 1 Color Blue Material PCB + plastic + iron Features High precision clock module Specification Working voltage: 3.3~5 .5V; Clock chip: high-precision clock chip DS3231 Application Various electronic products or DIY project Other With output TTL level signal indication; Can be connected directly to the microcontroller output IO port; Anti-interference ability; Connect the microcontroller to achieve the touch switch function; The standard 2.54mm pin to do input and output connections; Surrounded by a fixed mounting holes; Module parameters: Size: 38mm (l) x 22mm (W) x 14mm (h); Weight: 8g; Operating voltage: 3.3-5.5V; Clock chip: High-precision clock chip DS3231; Clock Accuracy: 0~40 range the accuracy 2ppm the error is about 1 minute; With two calendar alarm clock; Programmable square-wave output; Real time clock generator seconds minutes hours day date month and year timing and provides valid until 2100 with Leap Year Compensation; Chip temperature sensor comes with an accuracy of +/- 3; Memory chips: AT24C32 (storage capacity 32K); IIC bus interface the maximum transmission speed of 400KHz (working voltage of 5V); Can be cascaded with other IIC device 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57; With rechargeable battery LIR2032 to ensure the clock move normal as system power failure; Wiring instructions (with Arduino UNO R3 for example): SCL-A5 DA- A4 VCC-5V GND-GND English Manual/Spec Yes Packing List 1 x DS3231 clock module + LIR2032 button battery Manual: http://m5.img.dxcdn.com/CDDriver/CD/sku.222910.rar