NOYAFA NF-HDMI - Manual (Page 14)

Your excellent helper in cable test! 13
BATTERY LIFE AND REPLACEMENT:
Caution
To avoid unreliable test results, replace the battery
as soon as the low battery indication appears.
Warnings
To avoid possible electric shock or personal injury,
turn off the master unit and disconnect all test leads
before replacing the battery.
Battery Status:When ”POWER/LOW BATT.”
LED is flashing on the master unit, it means
the battery voltage is under 6.0V which couldn't
power the device on. Please replace the battery
as the following step:
1.Turn off the master unit and disconnect all test
leads before replacing the battery.
2.Properly replace the battery into the
battery case.
3.Use only a DC 9V(NEAD 1604/6F22) battery.
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Licensing, LLC.