A beeping device that is USB powering ESP8266 NodeMCU running the Konnected Alarm System Firmware and connects to Home Assistant.
Follow instructions on this page to flash the firmware
The mini breadboard doesn't have the room to fit the ESP8266 and the beeper so offset the board and have the unused pins not connected to anything.
The + pin on the buzzer connects to D7 and the G pin next to D5. This corresponds to "zone 5" in the konnected firmware.