Homlly Fingertip Pulse Oximeter (FDA Approved OLED Display)Receive SP O2 (Oxygen Saturation Levels), perfusion index, pulse rate results within 8 seconds on large digital OLED display. Homlly Oximeter is light, small size, low power consumption and convenient to carry with a detachable lanyard allowing you to measure your oxygen saturation anywhere. One button operation in 8sec and shut down automatically without operation in 16 seconds (Save energy) ABS material, the fingertip clip use silica gel material