Feature 1: Rubberized shockproof housing Feature 2: Multi-color crystal display Feature 3: Flat tuning up to 4 semitones Feature 4: Built-in visual metronome Feature 5: Free selectable calibration Feature 6: Built-in microphone & vibe sensor Feature 7: Attaches easily to all guitar headstock shapes Feature 8: 410Hz - 490Hz Feature 9: 360° moving head Feature 10: One-handed swivel clamp Including: Battery (coin cell, TYPE CR2032) Color: Black