MEI, also known as MEI Conlux, manufactures electronic payment systems. It offers electronic bill acceptors, coin mechanisms, banknote validation systems, and various unattended transaction systems. The company serves vending, soft drink, gaming, amusement, transportation, retail, and kiosk markets. The company was formerly known as Mars Electronics International, Inc. and changed its name to MEI in 2000. MEI was founded in 1969 and is headquartered in West Chester, Pennsylvania with additional offices in Australia, Mexico, China, the United Kingdom, Switzerland, Japan, France, Canada, Italy, Macau, Spain, and Germany.