This compact fingertip pulse oximeter can be used to measure blood oxygen saturation and pulse rate quickly by sticking one finger completely into the measuring parts of the oximeter, suitable for family and personal care in daily use. Features: Small size & light weight, compact and portable to use and carry. Clear HD LED display (monochrome type / colorful type optional), choose at will. Support 4 switchable display directions (up, down, left and right) for convenient reading, meeting your different needs. Clamp one finger with the oximeter, and with one-button operation, it will quickly and accurately measure SpO2 (blood oxygen saturation) and PR (pulse rate). When there is no signal generated within 8 seconds, it will automatically shut down to save energy. Mini oximeter with lanyard, portable for home or travel use. Specifications: Material: ABS + electronic components Color: White / Blue (Optional) Display Type: Monochrome / Colorful (Optional) Power Supply: 2 * 1.5V AAA battery