The GK-5 works with the GM-800 guitar synthesizer utilizing the GK IN jack (serial GK type).
*When connecting the GK-5 to a guitar synthesizer that has a conventional 13-pin GK jack, use it in combination with the GKC-DA (sold separately). Please refer to the related article: BOSS GK pick-up Compatibility guide
*The GK-5 does not have controls like the GK-3. Some operations may be limited when using it with a model such as GR-20 designed to use in combination with the GK pickup's switches and/or the pedal on the unit.