DECT is used primarily in home and small office systems, but is also available in many private branch exchange (PBX) systems for medium and large businesses. DECT can also be used for purposes other than cordless phones. Voice applications, such as baby monitors, are becoming common. Data applications also exist, but have been eclipsed by Wi-Fi. 3G and 4G cellular also competes with both DECT and Wi-Fi for both voice and data. DECT is also used in special applications, such as remote controls for industrial applications.