Description The Ellipse Matrix Blend combines the worlds best-selling undersaddle pickup, the Fishman Acoustic Matrix, with the popular Ellipse Blend, to give you incredible tone at your fingertips. With its flexible gooseneck condenser microphone, volume, blend and phase controls, the Ellipse Matrix Blend makes it possible to have the best of both worlds when you play. The sparkling, transparent sound and control that our Acoustic Matrix pickup is complemented by the unique and expressive character of a microphone. Pickup Length:Standard pickup length of 2.65 in. (67.3 mm) will fit most guitars with 2.5 in. (63.5 mm) string spacings Soundhole:Accommodates most round soundholefrom 3-7/8 in. (98 mm) to 4-1/8 in. (105 mm)in diameter Battery:9-Volt Battery Life:220 hours