LG Pro/2000 Ultrasound device

I have some questions about using the LG Pro/US 2000 ultrasound device and I don't see the answers in the user manual.

The US 1000 beeps after 5 minutes, but the LG Pro/2000 doesn't seem to give an indication that the 5 minutes are up. If I'm using the LG Pro/2000 on neck/head, there's no way to see the lights turn off on the device. For those using the LG Pro/2000, are you just setting a timer on your phone to know when the time is up, as I can't seem to tell when the device turns off.

Also, when I set a time on the LG Pro/2000, the green light illuminates, but then occasionally that light will flash. So if I set it for 5 minutes, the 5-minute light illuminates and stays solid sometimes, but sometimes that 5-minute light will start flashing. Is the flashing indicating it does not have proper contact with my skin? If so, it's hard to tell that's happening if the device is being used on the neck or head, as I can't see the lights while using it.

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