-Display parameters: SpO2 value of blood oxygen
-Display screen: the product adopts blue, red, green and yellow 4-color OLED display, with 5-level brightness adjustable
-Energy saving and environmental protection: the product has low power consumption and two AAA batteries can be used for more than 40 hours
-Voltage warning: when the battery voltage is too low and may affect normal use, there is a low voltage warning prompt
-Automatic shutdown: when no signal is generated, the product will automatically shut down after 8 seconds