Mini and Powerful Easy-carrying Red/Green/Yellow backlight LCD Easy-to-read LCD Displays Universal Keyring TunerFeatures:Mini &Compact designEasy-to-read   LCD screen, Super anti-interference.Newly design, fashionableTuning Sensitive and stable performance.Different colors to be selected Specifications:Tuning mode: Auto Tuning items: ChromaticA4 frequency: 440HZTuning range: A1(155HZ)-C8(4186HZ)Power supply: 1 x CR2032 cell buttonColor:Yellow, Blue, Red, PinkPackage Including:1 * Mini Tuner1 * 3V CR2032 Cell Button1 * User's Manual   

Professional Keyring Chromatic Tuner