Sierra 6 Function Touch Panel 12V24V SP21020 The Sierra 6 Function Touch Panel is an ultra-compact panel featuring a PET membrane touch panel faceplate designed for harsh marine environments. This panel has programmable buttons that allow each function to be programmed as a latching or momentary circuit. A 60 piece assortment of graphic and text labels is included for easily labeling each button. The Sierra SP21020 is designed to be easy to install. It uses a micro-USB cable instead of bigger, b