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The FL400 Black registers a constant reading in several seconds (24sec. for the most accuracy) and is able to provide quick information regarding your blood oxygen levels. Getting a reading is simple: Place finger in device and press power button. After scanning, a reading will be displayed; the left number is the SPO2 (blood oxygen saturation) level and the right number is the pulse rate. Accurate Reading The FL400 Black's new and updated technology allows reading to be quick precise. The user's finger must be placed in with the button pressed to turn on and measure. The device measures radial pulse. The BPM range is 30-240BPM. Easy Battery Removal Convenience is key and the FL400 Black is no exception to this. Battery cover is sturdy and easy to remove for battery replacement. There is a light indicator for low battery on the face of the device. Ergonomic Design Lightweight materials and compact structure make the FL400 Black an easy device to take on the go. Device is for all ages, but fingers that are too small show mixed results Device adjusts for small to large fingers. Your FL400 Black comes with: AAA Batteries X2 Carrying Case Lanyard Device specifications are listed as: Batteries must be facing in opposite direction to function. Dimensions: 2.25” x 1.20” x 1.25" Operating temperature 5°C to 40°C Operating humidity 15-80% RH This device is for sports and aviation use only, it is not a medical device. Sold and distributed in the US. Instructions only provided in English. Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.





