How do you switch between voltage and air/fuel mixture?

Mine reads voltage for about 30 seconds until the sensor warms up, then switches to A/F mixture automatically.

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Manufacturer	GoolRC
Brand	GoolRC
Item Weight	10.6 ounces
Package Dimensions	6.69 x 4.8 x 3.31 inches
Country of Origin	China
Manufacturer Part Number	XET8324280782382AP

GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover

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