1、Can measure blood oxygen saturation and pulse rate at the same time. It is displayed in a variety of ways with numbers and graphics. Provide comprehensive health information. 2、The measurement is fast and accurate, the infrared measurement is transmitted within a few seconds, and the blood oxygen is collected by the principle of photoelectric sensing. 3、High‑definition large‑screen digital display, using high‑definition LED digital tube display, clear measurement results. 4、Powered by 2pcs AAA batteries (battery not included), it will automatically shut down after 8 seconds without finger sensing. 5、The shape is small, does not occupy space, and is easy to carry, which is very convenient for home or travel. The package also includes a lanyard, which can be hung on the instrument to prevent loss. Item Type: Finger Pulse Oximeter Material: ABS Color: Black and WhitePower Supply Mode: 2 x AAA batteries (Not included) Instructions for Use: 1. Insert two 1.5V batteries(not included) 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, can realize the fixed order switch of 4 directions. 5. Automatically shut down after 8 seconds without finger induction. 1 x Oximeter 1 x Lanyard 1 x Manual