Portable: The ultra-small size of 4.7x2.8x3.7 inches makes it easy to carry it anywhere without taking up your luggage space. Adaptation Type: This box is compatible with multiple oximeters on the market, including OxyU,SleepU,CheckmeO2 Max,VisualOxy,S1/S2 Baby Oxygen Monitor. Scientific Design: The blood oxygen storage box is composed of a hard outer shell and a sponge pad. The outer shell prevents the device from being squeezed; And the internal sponge pad prevents the device from being damaged or scratched during movement. Abundant Storage Space: The mesh pocket on the top can store charging cables, lanyards, or blood oxygen probes. Note: Only case, the pulse oximeter is not included. Portable storage case for adults pulse oximeter and baby oxygen monitor