The Edge accessory system (EAS) was created with future expandability in mind. The architecture of the EAS allows users to connect multiple accessories daisy-chain style to the evolution CS or CTS. This means Edge can create optional accessories that can be added to the products by the owner at any time. An optional exhaust gas temperature (EGT) probe is one example of an optional accessory that will be offered by Edge. Look for a variety of other optional accessories to become available in the near future. Connect To A Key Switch Power/Grnd Source; Insight Turns Digital Compatible w/Edge Accessory System Data Logging w/New Export To CSV File w/Insight CS/CTS Stores Records When Combined w/Insight CS/CTS Audible Alerts When Combined w/Insight CS/CST Custom Screen Backgrounds When Combined w/Insight CS/CST Internet Updateable Back-Up Camera Compatible w/CTS Additional Attributes: GTIN: 00810115012245 WARNING CA Proposition 65: No Packaging: Quantity of Each: Package UOM: Dimension: 9.5000 x 6.2500 x 1.5000 inches