The Arduino Mini is a small microcontroller board based on the ATmega168, intended for use on breadboards and when space is at a premium. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 8 analog inputs, and a 16 MHz crystal oscillator.

This device is very small and requires an external serial connection for programming. It can be programmed with the Mini USB adapter or other USB or RS232 to TTL serial adapter. USB/Serial converter is handy with it.

Microcontroller ATmega168 Operating Voltage 5V Input Voltage 7-9 V Digital I/O Pins 14 (of which 6 provide PWM output) Analog Input Pins 8 (of which 4 are broken out onto pins) DC Current per I/O Pin 40 mA Flash Memory 16 KB (of which 2 KB used by bootloader) SRAM 1 KB EEPROM 512 bytes Clock Speed 16 MHz

Difference between Arduino Mini and Arduino Mini Light is just that Mini has connectors on it and for Mini Light you need to add pin headers by yourself.