USB killers are malicious devices disguised as USB flash drives. The USB Killer Detector described here lets you identify such pen drives.
USB Killer Detector
USBKill USB Kill devices for pentesting & law-enforcement
Short Circuit Detector VC04 Upgraded Version iShort Pro Multi
MECHANIC iShort Max Circuit Detector Multi-function Short Killer
USB Killer Detector
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USB killer V5.0 U Disk Killer Miniature High Voltage Pulse Generator with Accessories
USB Killer Detector V1
How to detect a USB killer - Quora
Compatible with e.g. iPhone 5.6 or 7 MicroUSB, USB-C adapter FCC and CE certificates Inconspicuous design Non-traceable operation
USB Kill Adaptor Kit - for the iOS and Android telephones
USBKill USB Kill devices for pentesting & law-enforcement