Auto power off after 10 minutes of inactivity (no button pressed and no signals detected), the tester will emit one long beep (~0.5s) and then shut off note: if the flashlight is on, it will be also shut off
Low battery indication if battery voltage is less than around 2.4V, the green led in the tip will flash 3 times and the buzzer will send out one long beep, then turn off the device