KQSR (100.9 FM, "Mix 100.9") is a commercial hot adult contemporary music radio station in Yuma, Arizona also serving El Centro, California. The station used to be known as "The Jet" and aired a classic rock format. It adopted the slogan "Star 100.9" and aired an adult contemporary format. The program Director since May, 2009 is Jeff Edwards, who also hosts the weekday midday show from 10am–3pm. His show includes The '80s Lunchbreak, an all 1980s hour from 11am to 1 pm. Jeff Edwards also hosts a Saturday morning 1970s show, 70's Spotlight Saturday from 8am until noon.