Fishman Matrix Infinity Wide PRO-MAT-INF - new style pickup system for acoustic guitar, under bridge installation, 3.2mm acoustic matrix wide co-polymer pickup, active Infinity endpin preamp, switchable preamp characteristics/voicing to match guitar style and size, small soundhole-mounted control unit with volume and tone controls. Pickup width: 3.2mm. Requires 9V block battery (not included). Professional installation required.