TYREDOG TD-4000A-X - Manual (Page 26)

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3. Automatically power off
A. After power on, if there is no signal from sensors in 20 minutes
B. Being no signal received for more than one hour after the last signal
received.
4. Abnormal status
A. Tire pressure below lower warning value
When tire pressure is below lower warning value (default value= 26
PSI), LCD monitor will beep and vibrate once in 10 seconds and
repeat for 5 times.
Take F (front tire) for example
B. Tire pressure higher than upper warning value
When tire pressure is higher than upper warning value, (default value=
45 PSI), LCD monitor will beep and vibrate once in 10 seconds and
Blinking