Fishman Neo D Magnetic Humbucker Acoustic Guitar Pickup Item #: FSM NEOD1HUM 

With the New Fishman Neo-D Acoustic Pickup you can plug and play right out of the box.
The use of a neodymium magnet insures better string to string balance and more sparkling clarity than other pickups using standard ceramic magnets. Its stacked coil design eliminates noise while providing full, warm acoustic tones. Its low profile, high impedance design is completely passive which does not require a battery or any costly and intrusive alterations to your instrument. Fits soundholes down to 3-7/8 inches diameter.