What is the relationship between enhance and California in the context of the input sentence. Choose an answer from: 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