this is a usbdriveby the can be used to install rev-tcp shell to connect to meterpreter session or used for dns spoofing attack
https://github.com/Cryoganix/Teensyterpreter
https://www.youtube.com/watch?v=FfRhKzbgmeU
https://github.com/samyk/usbdriveby
price $16-$24 hardware:
https://www.pjrc.com/teensy/