Vlectro VL-AT Mode D'emploi page 7

"0.00‰BAC" will be shown if the reading is lower than 0.05‰BAC.
Low battery detection
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This device using 2 * 1.5V AAA alkaline batteries, if the batteries are low, "Lob" and the
battery symbol in the upper right corner flashes 10 times together with "di-di" sound
prompt to remind that need to replace new batteries, then device power off automatically.
Please replace new batteries for normal use.
Warning
While low battery, device cannot work normally, need to replace new
batteries, or it won't power on.
Specifications
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Vlectro VL-AT
Low battery prompt