RDKS RELAY TOOL: For GM series vehicles equipped with a tire pressure monitoring system, a "sensor learning procedure" must be performed after rotating tires, replacing a remote door lock receiver module, or replacing a tire pressure sensor. This relearn process can be accomplished with special tools 2006-2020 models supported: EL50448 The RDKS sensor is an essential tool for replacing tire pressure sensors, removing or replacing tire pressure alarms. Suitable for most GM engines with RDKS sensor from Opel, GMC, Chevrolet, Buick, Cadillac. Easy to use: Reset tire pressure in just three steps. Press the button to reset the tire pressure. Easy to use: Reset tire pressure in just three steps. Press the button to reset the tire pressure. Save time and money: Activating the tool is quick and easy. A single TPM sensor can be activated by pressing a button within 1-2 minutes. Save time and money. There is no need to go to a specialist store. NOTE: Attach the tool to the sidewall of the tire near the valve stem for inspection. Tips: No battery Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.