It is the same tuner as the SN-6 (but with a brighter display and a faster chip).

THESE TUNERS HAVE BEEN SOLD OVER 20000 TIMES! AT THIS PRICE, YOU CAN'T BEAT IT!

Chromatic Tuning capability (A piezo pickup senses the vibration of the strings through the neck, so it doesn't need to hear the tone. Great if you're playing on a stage or in a noisy environment.)
It's awesome for dark stages! Back-lit screen (Red when flat, yellow when sharp, and blue when in tune.
Operation with just one button. (A large, simple power button turns it on and off.)
A typical battery lasts about a year under normal use. The battery is included (1x CR2032 coin battery.