This item is a battery holder/coin cell adapter PCB that lets you mount a standard CR2032 battery holder over top of a PCB layout that uses a soldered-in battery. It basically converts the pin layout from one of many odd 2- pin and 3-pin board styles into the common battery holder style. In the future, battery replacement will be a snap! Save your gear from leakage, damaged traces and lost sounds! Was designed for Yamaha DX7 synth. The Instructions are here.