existing passive pickups such as the Martin Thinline, Fishman AG-125, AGX, Sound Board Transducers and most other manufacturers pickups. The Powerjack is futuristically efficient; its tiny circuit board, housed in a slightly elongated endpin jack, has such low current draw that it will work for four years without a battery change if played 8 hours a day. In addition, the Powerjack is "blender-ready"; a microphone can be added easily. with the Powerjack then switched on continuously, the battery will still yield more than a year of guitar playing. the Powerjack will be available from Fishman separately or in systems with an AG-125 or AGX pickup. if you have a passive piezo pickup or plan to buy one because you like the punchier acoustic sound, Fishman's new Powerjack will wake up those crystals and give you a pickup with punch that you can use for years to come.