Fishman Matrix Infinity Narrow PRO-MAN-INF New Pickup system for acoustic guitars, under bridge installation; Acoustic Matrix narrow (2,3mm) co-polymer Pickup; active Infinity Preamp with strap endpin; Characteristics / Preamp Voicing switchable to match guitar styles and sizes. Small Soundcontrol-unit with volume and tone controls is installed inside the sound hole and enables an intuitive tone control. Pick-Up width: 2,3 mm; 9-V Battery (not included).