Have a listen to the sound of the MCL34 launching for the first time in front of the McLaren and Renault workers.
McLaren will be entering their second year with Renault as engine suppliers, hoping to improve on last year with Carlos Sainz and rookie Lando Norris in the drivers seats for 2019.
The British team will be unveiling their car fully on the 14th February ahead of testing in Barcelona, which starts on Feb 18-21 and Feb 26 - March 1.