Easy install: Mounts to soundhole, Velcro attaches battery bag attaches inside your guitar, easy mount end-pin jack. The ACS delivers quality amplified acoustic guitar tone without the feedback issues. It offers a broader frequency range than a piezo pickup while delivering authentic acoustic tone with enough volume to play alongside a large band. The ACS employs a unique internal preamp that’s been tailored for the phase and frequency response of an acoustic guitar while still retaining a brilliant top-end favored in acoustic guitar tone. Volume control is mounted on the pickup and poles are easily adjustable to tailor your output for your guitar/amp set up. Sells new for $159. This unit is in clean shape and just $100.