Warm and full acoustic tones with a convenient, accessible onboard volume control wheel. Revoiced and fine tuned for smoother treble response Cutting edge neodymium magnets now produce a warmer more naturally acoustic tone Active electronics for a pure, clean sound Newly designed mounting system and ergonomic body shape Excellent string to string balance Miniature batteries (included) mount conveniently on the underside of the pickup Low current design allows 300 hours use between battery changes Fits in soundholes as small as 3 5/8 inch (92mm) diameter Pre wired output jack can also be endpin mounted Easy installation with no alteration , plug and play right out of the box