1、High‑definition TFT large‑screen digital display, using high‑definition LED digital tube display, the measurement results are clear. 2、The infrared measurement can be transmitted within a few seconds, and the blood oxygen signal is collected by the photoelectric sensor principle, the measurement is fast and accurate. 3、Numerical and graphic diversified display, blood oxygen saturation and pulse rate can be measured simultaneously 4、It will automatically shut down after 5 seconds without a finger, which saves more power. 5、Compact size, light weight, simple and stylish, detect blood oxygen anytime and anywhere. Condition:100% Brand New Item Type: Fingertip Pulse Oximeter Material: ABS Power Supply Mode: 2 x AAA battery (not included) Instructions: 1. Load two 1.5V batteries according to the positive and negative signs in the battery slot and close the battery cover; 2.Pinch open the clip of the finger clip pulse oximeter, insert your finger into the rubber channel (the finger should be fully extended), then release the clip, and click the switch button on the front panel; 3. Do not shake your fingers during use, and it is best not to move the human body in order to read accurate data; 4. After booting, the interface direction switch defaults to the button mode, short press (less than 2 seconds) the button, you can switch in a fixed order in 4 directions. 5. Automatically shut down after 8 seconds without finger induction. 1 x Oximeter 1 x Lanyard 1 x Manual