We are using the new LR Baggs IBEAM Active System (Classical). It is a combined pick-up and pre-amp with a 1/4 inch jack connector. This pick-up is specifically voiced for nylon string instruments and has a high degree of fidelity which will bring out the dynamically rich voice of your Harpsicle® brand Harp. The pre-amp is also specifically designed to add a bit of compression and auto-EQ to render a warm, analog voicing without the need for an additional EQ board. The IBEAM Active system is powered by a common 9V battery, which provides approximately 1,000 hours of playing time when plugged in. Note: Make sure to unplug any cables from the harp when you are not using it. This will prevent the battery from being drained through the cable when you are not using it.