What is the fine-grained topic of the following text: Some Chinese-manufactured shipping-barcode handheld scanners — of the type used by many United States retailers and warehouses, as well as delivery services such as UPS and FedEx — were found to have sophisticated spyware preloaded on them, according to San Mateo, California-based security company TrapX. Only return the topic.
Spyware on Chinese-manufactured shipping-barcode handheld scanners