This is a portable device to measure SpO2 (blood's oxygen saturation levels) for household and personal use. The measuring operation is easy and quick, you just need to place your finger inside the photoelectrical sensor and accurate measurements will be display on the screen. Suitable for all ages, choose one to have a good of the health of your families and yourself to the happening of some cardiovascular and cerebrovascular ! Features - Color: Random Color. - Material: ABS. - Size: About 6x3.5x3.8cm. - Note: Without Battery. Self-prepared 2 AAA batteries. - Made of materials for durable long time use. - Accurately determine your SpO2 (blood oxygen saturation levels), rate and strength and display it conveniently on a large digital LED display - Small in size, light in weight,and convenient to carry - For sports enthusiasts like mountain climbers, skiers, bikers or anyone interested in measuring their SpO2 and rate. - This product is suitable for the hospital,oxygen bar,sport health (using them before or ,do not advising using them during the movement),and community ,etc. Package list: 1 x