This display module is based on the TM1637 display controller chip and is available with red, green or blue .056" digits and either decimal points or a colon for clock applications.
The module runs from a 5 volt supply and the interface is two wire serial, similar to, but not compatible with I2C. There are several libraries available on the web to drive TM1637 display modules for both Arduino and Raspberry Pi. A link to our favorite Arduino library is in the resources section below.
External 4.7K pull up resistors on the CLK and DIO are required for most applications and are included with the module.