The Fishman Rare Earth(TM) active soundhole pickup is America's most trusted active single coil, high-output, low-noise acoustic soundhole pickup. Excellent string to string balance. Easy installation with no alterations. Ready to play right out of the box. Brilliant, articulate sound for those who prefer the single coil sound. Active electronics give you pure, clean sound. Powered by a pair of watch/hearing aid style batteries. Low profile design. Fits soundholes as small as 3 7/8 inches. End jack provided maintains a more esthetic look than with some other soundhole pickups. Will not harm your guitar in any way. A great choice to easily amplify your acoustic guitar easily and quickly. For a limited time comes with a free bridge pin puller.