ChoiceMMed C20 Pulse Oximeter Fingertip Pulse Oximeter Blood Oxygen Saturation Monitor Large OLED Screen SPO2 Monitor with Lanyard and Carrying Case pets_Jan2025_BestSellers Boxing Reflex Ball 3 Difficulty Package includes 100 packs Boxing Reflex Ball 3 Difficulty Level Boxing Ball with Headband Suit for Reaction using mobile phones Place one of your fingers into the pulse oximeter to the end and press the switch button one time on front panel to turn it on [ Accurate and Reliable ]: ChoiceMMed oxygen meter finger pulse oximeter accurately determine your SpO2 in 10 seconds and can read and display up to 100% on a larger screen in 6 display modes