Fits John Deere S100, S110, S140; E100, D100, LA100, L100, S240 Series. The connector sends information to the MowerPlus app via Bluetooth wireless technology when the tractor key switch is on and the mobile device app is running within range. The wireless connector and app work together to track usage, flag maintenance intervals and offer mowing performance feedback. No tools are needed for installation. The MowerPlus Hour Meter Connector is only compatible with iOS 10 or higher. Android versions are not compatible.