USB killers are malicious devices disguised as USB flash drives. The USB Killer Detector described here lets you identify such pen drives.
Packaging USBKill - Phabricator Tickets - Whonix Forum
EF-HR1520 Short Killer Pro by Power of Supply Short Circuit Detector
Killer USB Drive Is Designed To Fry Laptops
USB Killer Detector
USB Killer Detector
Protect USB Ports From Nefarious “USB Killers
How to shut down a plant remotely in 3 seconds. - OTIFYD
Former student zapped $58,000 worth of PC equipment using a 'USB Killer' device : r/news
USB Killer Detector
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Klein Tools ET920 USB Power Meter, USB-A and USB-C Digital Meter for Voltage, Current, Capacity, Energy and Resistance
USB Killer Detector
Non-traceable damage of computer motherboard USB Killer V4
high voltage - How do I test a USB drive to be sure it is not a “USB killer” - Electrical Engineering Stack Exchange