RENNtech | Hand-Held Suspension Module BluetoothRENNtech Bluetooth HSM Digital Suspension Lowering Module for vehicles equipped with Airmatic Magic Body Control Suspension NOTE: HSM integrates with M. B. COMMAND system up until Model Year 2020. For later model years (2021 2023) RT App is required. The RENNtech Hand Held Suspension Module (HSM) is designed to work with the Mercedes Airmatic Suspension. The unit allows the user to have full control over all four corners of the vehicles suspension and