TTLS is an EM Locking system designed to provide a secure electronic locking mechanism for top dome covers (TDC) and Outlet Valves (OV)/Discharge Faucets of every tank truck carrying HPCL fuel for each trip to the retail outlet. Encrypted Key is programmed for short time if authenticated using OTP by retail Owner. Once Key is programmed, it can be used to Unlock the EM Lock. Mobile App is used to manage End to End Unlocking and locking operations.