The CT-01 features fast and accurate tuning, a bright and colorful display, and is suitable for guitar and bass guitar tuning in any situation. A straightforward and intuitive UI and mechanical clip allows users to tune quickly and comfortably, without having to worry about the tuner being in a wrong or hard to read position.   Features: Clip-on tuner designed for guitar and bass guitar tuning.  Fast and accurate tuning from 435 to 445Hz.  Gravity sensitive colorful full-screen display, easy to read tuning information.  Metal clip with 180° rotatable hinge, convenient and flexible to use.  The tuner will enter power saving mode after 10s and will turn off automatically after 2min, if no input signals.   Specifications: Model: CT-01;  Tuning Items: guitar, bass guitar;  A4 frequency: 435Hz-445Hz;  Power Supply: 1 * CR2032 Battery (not included);  Item Weight: 25g/ 0.9;  Package Size: 6.5 * 4.5 * 3.7cm/ 2.6 * 1.8 * 1.5in;  Package Weight: 40g/ 1.4oz;   Note: The guitar showed in the picture is not included.  The battery is not included.   Package List: 1 * Tuner;  1 * Users Manual