RFID technology uses radio waves to electronically identify objects. It consists of tags attached to objects and readers that can retrieve data from the tags, including serial numbers and other information. Common applications include access control, asset tracking, supply chain management, and electronic toll collection. A survey found that most small and medium enterprises see potential benefits of RFID in convenience and data storage, but costs remain relatively high compared to barcodes. Further development of RFID is focused on medical and library uses.