Portable, customizable electronic device, namely, a handheld security testing device with onboard computer software development tools, open-source firmware, and an operating system reminiscent of a computer game, for use in interacting with and testing the security of other electronic devices by spoofing two-factor authentication, emitting and receiving infrared signals, storing access-control credentials, transmitting and receiving wireless signals, and scanning, analyzing and penetration-testing radio protocols, computer interfaces, USB ports, and computer hardware; computer hardware for detecting and identifying access to computer networks and resources, performing vulnerability scans, and penetration testing