2PCS B57 NO.5/NO.7 Electricity Tester Battery Box Shaft Diameter (mm)_8.0 MPN Description MDK-M10000510-1-01

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2PCS B57 NO.5/NO.7 Electricity Tester Battery Box Shaft Diameter (mm)_8.0 MPN Description MDK-M10000510-1-01Instructions: Insert the battery into the battery compartment and judge the power according to the indicator light. 4 lights on: full battery 3 lights on: there is more power 2 lights on: low power, small power appliances such as mouse and remote control can still be used 1 light on: there is almost no power, it is recommended to replace

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