Accuair e-Level+ ECU only for retrofits. This ECU will bring your current e-Level system up to date with the latest technologies. Supersedes Accuair Part# AA-E+ECU. New Part # AA-3638. For USA 50 States. Embedded bluetooth 5.0 (the power of our module is barely allowed by FCC so the range will be at least double any other systems on the market). Customizable back lighting (RGB). Anodized aluminum ECU enclosure. More robust hardware with full shutdown mode after 24 hours to prevent ANY battery draw. Important Note: This product is an upgrade if you already have an existing AccuAir system including any SwitchSpeed or e-Level built prior to 2019 (R9 and R10 e-Level systems). This product listing is for the ECU ONLY and does not include a harness or pressure sensor.