The Aloha Twin is an internal double-sensor pickup specially designed for the ukulele. The pickup system has a strong output signal and works nicely without a preamp. The Aloha Twin can be installed two ways: 1. With the supplied double-sided adhesive tape in front of the bridge plate (or bridge, if no bridge plate is present) on the inside sound board. 2. With superglue on a flat bridge plate (or directly under the bridge, if no bridge plate is present). Please note that the bridge plate must be completely flat – it will not work if the bridge plate is radiused, which means it is curved up, e.g. Mele Ukuleles.