Untested item please see photos Item was tested for power only. No power supply. The Wasp WCS3900 Barcode Scanner is a handheld device with USB connectivity, perfect for retail and point of sale applications. As part of the Wasp WCS series, this model offers reliable performance without the need for a power supply, making it ideal for businesses looking for a convenient and efficient barcode scanning solution. The Wasp brand ensures quality and durability, making the WCS3900 a trusted choice for those in need of a compact and user-friendly scanner.