Fitting of DIY, great for Arduino DIY project, exercise your hand and brain.

Features:
The real time clock has the ability of calculating prior to the 2100 seconds, points, when japan week, month, year, and the ability to adjust a leap year.
31 8-bit RAM, wide working.
Read/write clock or RAM data have two transmission way: Single-byte / many bytes group.
8 feet DIP assembly or optional 8 feet SOIC encapsulation according to surface assembly.
Double main and backup power supplies.

Specifications:
Type: clock module
Color: blue
Material: PCB + metal
Battery: 1 * CR1220 battery (not included)
Weight: 8g / 0.28oz
Size: 5.0  * 1.7 * 0.6cm / 1.97 * 0.67 * 0.24in ( L * W * H )

Packing list:
1 x DS1302 real time clock module
1 x Dupont cable (21cm)