Brand: L.R. Baggs
magnetic soundhole pickup w/ body sensors, pickup responds to the string vibration along with the body vibrations, active version includes an internal Class A discrete preamp / line driver powered by a 3V lithium battery, easy access built-in volume control wheel, quiet and hum-free, highly feedback resistant, adustable pole pieces, built in gold plated 1/8" jack, prewired strap jack assembly with 1/8" plug and 1/4" jack (can be installed permanently if you wish), great sounding easy to use pickup from Baggs. To use on left-handed guitars simply reverse the sequence of the pole pieces. Soundhole must be at least 3.5" in diameter and centered beneath the strings.