Utilize the input text as a context reference, choose the right relationship between enhance and California from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Now that we have completed the closure of the Oxnard, California manufacturing facility and moved all product assembly to Tier 1 contract manufacturers, we will be able to leverage the efficiencies gained in working with these experienced manufacturers to enhance the margin profile for our telematics devices.

Answer: headquarters_location