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Barcode scanners, also known as barcode readers, can be used to scan and decode barcodes and to transmit barcode data to a computer or another host system. Barcode readers with a single-line laser can be used to scan linear, one-dimensional (1D) barcodes. Some lasers can produce light in an omnidirectional pattern to allow scanning of barcodes from different angles. Other barcode readers contain CCD (charge-coupled device) light sensors instead of a laser for accuracy and wear resistance. Barcode scanners with raster scanning, area imaging, and other scanning technologies can allow scanning of two-dimensional (2D) or Portable Document Format 417 (PDF417) barcodes, among other types. Some barcode readers provide onboard flash memory to allow the storage of barcode data before transmitting it to a computer or host system through a USB cable or wireless WLAN or Bluetooth connection. Many barcode readers have a handle for handheld use and come with a stand or a charging cradle for fixed position applications, while others are designed for stationary use on a counter or another flat surface. Some portable readers are small enough to be carried in a pocket or attached to a lanyard. Barcode readers are used at retail checkout counters and other points of sale (POS) locations and in warehouses and shipping facilities.