Features:
Portable and folding guitar or bass tuner that can attache to your keychain or fits in your pocket.
Plug-in design, just insert the 1/4" connector into your guitar/bass output jack, then you can use the tuner.
Flat tuning allows to "drop-tune" your instrument down to 7 semitones below the standard A440 pitch.
With LED meter, easy to read the tuning information.
With a small LED flashlight for on-stage illumination, very considerate design.

Specifications:
Brand: KORG
Model: GB-1
Tuning: 12 note equal-tempered
Detection Range: guitar--B1 7b(41.20Hz)-B6(1975.54Hz); Bass--B0 7b(20.60Hz)-B5(987.77Hz)
Flat Tuning Function: 1-7 semitones(half steps)
Detection Accuracy: better than ±1 cent
Connection Jack: 1/4" mono input jack
Power Supply: 1 * 3V CR2032 Lithium Battery (not included)
Item Weight: 27g / 0.9oz
Package Size: 13.5 * 8.5 * 3.5cm / 5.3 * 3.3 * 1.4in
Package Weight: 70g / 2.5oz

Note:
Battery is not included.
Always hold the part just above the input plug when you install or remove the tuner from your instrument to avoid damage the tuner's body.

Package List:
1 * Tuner
1 * User Manual(English/Japanese/French/Spanish/German)