It will automatically shut down within 15s. Beep Warning Just put your finger in the sensor, wait a few seconds to get the data. Includes 2AAA batteries, you can start using it when you receive the product.

Brand: Wawech
Type: Finger pulse oximeter
Display Type: LED
Power Source: Battery
MPN: YM201
Features: With Alarm
Country/Region of Manufacture: China
Product Line: Pulse Oximeter
Colour: White and blue