Hi Za Zee, thank you for your question. When it's your turn to upgrade your car’s IU to an OBU, you will receive a notification from LTA with your two-month installation period. You can book your installation appointment online or via the LTA Call Assist Service at 6377-2255. If you miss your allocated period, you will need to pay $35 for motorcycles and $70 for other vehicles. For installation with vehicle servicing, please contact your preferred authorized workshop directly.