Fishman’s classic Acoustic Matrix Natural preamp with the added benefit of ergonomic soundhole-mounted Volume and Tone rotary controls. Features the same tried-and-true, flagship Acoustic Matrix pickup found in all of our other premium systems. FeaturesErgonomically designed soundhole-mountedVolume and Tone controls at your fingertips (pre-soldered to preamps)System includes an Acoustic Matrix Undersaddle Pickup and active endpin mounted preampPickup available in wide, narrow or split formatsAdhesive-mounted battery bag includedNatural II preamp delivers a flat response for larger instruments such as a dreadnaught guitarSpecsDimensions: 2.46"" (67.3Mm) LOem-Mat-Vt1Wide Format: 1/8"" (3.2mm) Width (Natural I)Oem-Man-Vt1Narrow Format: 3/32"" (2.3mm) Width (Natural I)Oem-Mat-Vt2 Wide Format: 1/8"" (3.2mm) Width (Natural Ii)Oem-Man-Vt2 Narrow Format: 3/32"" (2.3mm) Width (Natural Ii)Battery: 9-VoltBattery Life: 500 Hours.