OLED Fingertip Pulse Oximeter Household Blood Oxygen Saturation Monitor with Lanyard Condition: Item Type: Oximeter Material: ABS Power Supply Mode: 2pcs AAA batteries (Not included) Usage: 1. Load two 1.5V batteries according to the sign of positive and negative in the battery slot and cover the battery cover; 2. Pinch open the finger clip of pulse oximeter, insert your finger into the rubber channel (fingers should be full extended), then loosen the clip and click the switch button on the front panel; 3. Fingers should not shake during use, and the human body should not be in motion, so as to read accurate data; 4. After starting up, the default direction switch of the interface is the button mode. Press the button short (less than 2 seconds) to realize the fixed sequence switch of 4 directions. 5. Automatic shutdown after 8 seconds without finger induction. Notes: 1. Please do not pour liquid on the oximeter during cleaning to ensure that no liquid is allowed to enter. Also be careful when wiping to prevent water from entering; 2. Please use oxygenometer in the environment required by performance indicators; 3. Avoid exposure, direct sunlight, contact with organic solvents and corrosive gases; 4. If not used for a long time, please take out the battery in the oxygen meter.