The Fishman Neo-D Humbucking Acoustic Guitar Soundhole pickup.

This value-priced cousin of the award winning Rare Earth pickup shares the same neodymium magnet structure for exceptional string balance and sparkling acoustic clarity. The Neo-D’s low-profile, high-impedance design needs no battery. Available in Single Coil and Humbucking models.  This Humbucking model provides warm and full humbucking sound.

Features:

• Neodymium magnet structure for exceptional string balance and sparkling acoustic clarity
• Low profile, high impedance design needs no battery
• Easy installation with no alteration plug & play right out of the box
• Excellent string-to-string balance and acoustic clarity
• Fits in soundholes as small as 3-7/8" (98.5 mm) diameter

Download user manual here