ACCURATE & FAST tuning with 1 cent precision. EASY TO READ deluxe LED display provides clear tuning results. Improved analog circuitry delivers real signal with no loss of tuning accuracy. COMPATIBLE WITH MOST ELECTRIC INSTRUMENTS, including seven-string guitars and five-string basses. SOLID CONSTRUCTION made of high-quality zinc alloy for durability and sturdiness. Compact mini size saves space on your pedal board. CHROMATIC TUNING suitable for a wide range of instruments. LED LIGHT INDICATOR shows working status and clear tuning results. Easy to read for accurate tone detection. FEATURES NEW fast and precise strobe mode with +/- 0.1% accuracy. EASY TO USE: Connect power and audio cables to enter bypass mode. Press bypass switch to activate tuning mode. Display shows black when no signal is input; solmization and fine tuning indicators activate. Blue center LED lights up when tone is accurate. RANGE: 12Hz ~ 4186Hz (C8) INPUT: 1/4 inch monaural jack (Impedance: 100K Ohms) OUTPUT: 1/4 inch monaural jack (Impedance: 0 Ohms) POWER SUPPLY: DC 9V (negative center) WORKING CURRENT: 90mA WEIGHT: 268g (with box) DISPLAY INSTRUCTIONS: 1. Step on footswitch to enter mode; indicator turns on and remains silent. 2. Display shows "-" when no signal is input; solmization and fine tuning indicators activate. 3. Blue center LED turns on when tone is accurate. 4. Unit bypasses signal with no display when out of mode. COLOR: Silver MATERIAL: Zinc alloy SIZE: 9.5 x 4.5 x 4.8cm PACKAGE CONTENTS: 1 x Guitar Effect Pedal 1 x User Manual (English) Note: Light and screen display differences may cause slight color variation between image and actual item. Measurement may vary by +/- 1-3cm.