Fishman Matrix Infinity Split PRO-MAL-MINF- new pickup system for Lowden or some Takamine Models acoustic guitars (under-bridge installation). Active Infinity preamp with switchable voicing to match guitar styles and sizes. Small sound control unit with volume and tone controls is installed inside the sound hole and enables an intuitive tone control. pickup width: 2.3mm. Requires 9V battery (not included). Professional installation required.