Check the listing for details. USA LK Fingertip Pulse Oximeter Blood Oxygen Monitor SpO2 Lnyr LED Batt Not Incl. Color: Blue, Condition: New. Listed at 3.87 USD. LK87 Series Fingertip Pulse Oximeter Blood Oxygen Monitor SpO2 Meter LED. Condition is "New". Shipped with USPS First Class. Battery Not Included Battery, and Case not included just the unit with a lanyard in a retail box. For limited time includes lanyards! Now with easier lanyard insertion channel!!!! Offers only accepted for multiple units. NOTICE: The battery placement (not included) is inverted +- on the right side and -+ on the left side as per the diagram. Please ignore the springs the batteries do not go in the same way. See attached picture for placement. If you want a guaranteed delivery date you can use our 3-day deliverr fulfilled listings for faster delivery!Large discounts for 6+ units, simply send us offer! May ship from multiple locations from deliverr including Florida, Texas, New Jersey, and California.