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Fretlord's Fret OptiX system illuminates your fret board position markers with LED light. This LED module enables quick color changes and works with your existing fiber optic cable. One LED provides up to 12 points of light across a single fiber optic.Each high output LED module is powered by (1-2) replaceable lithium coin cell batteries (included) with up to 20 hours of battery life. (Color specific)How to determine your scale length:Measure the distance from the fret board side of the nut to the middle of the 12th fret wire. DO NOT include the nut. (This distance in inches x2 equals the scale length of your fret board ) Ex. 17" x 2 =34"

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Fretlord Fret OptiX Color LED Module for Fretmarker Light Features:

Red fiber optic lightEasy Peel & Stick FiberTransparentDesigned by a GuitaristMicro Size DiameterFits 19 to 24 Fret Lengths (9-12 Markers) Scale SpecificPre-Sized For Guitars & Basses

Fretlord Fret OptiX Color LED Module for Fretmarker Light Specifications:

Powered by 2 x 2016 lithium coin cell battery (included) with up to 20 hours of battery life.Nut to 12th fret measurementGibson Guitar: 12.25" x 2 = 24.5", 22 frets, 10 markersFender Guitar: 12.5" x 2 = 25", 24 frets, 12 markersAlembic Bass: 17.5" x 2 = 35", 24 frets, 12 markersFender Bass: 17" x 2 = 34", 20 frets, 10 markers