Guitar Pickup, Matrix Infinity VT Pickup & Preamp System, Wide Format, Endpin Jack Mounted Preamp in Newly Designed Soft Touch Housing, Soundhole Mounted Volume and Tone Control Enclosure, Exclusive Tone Control Scoop that cuts the mids while boosting the highs and lows, accessible and relocated voicing switch to accommodate all guitar body sizes and live situations, built-in low battery LED indicator located on the internal preamp, includes Steel String and Nylon String Control, Chrome Baldric Button and Mounting Hardware, Solderless Connections, Professional Installation Recommended, Standard 2.65” (67.3mm) Pickup Length Will Fit Most Guitars with Spacing between 2.5” (63.5 mm) strings, uses a 9V battery, battery life: 160 hours.