Check the listing for details. Jziki Pulse Oximeter with Digital LED Display & Lanyard (Blue). Condition: New. Listed at 9.99 USD. General Features:Color: BlueFingertip Pulse OximeterMeasures your oxygen saturation levelLightweight and easy to useLED display - displays SpO2 (Oxygen level, or saturation) / PRdata (pulse rate data)Simultaneous display for testing value and plethysmograph Low perfusion down to 0.3%Visual alarm functionReal-time spot checksLow battery voltage indicatorAuto switch offPowered by 2 x AAA Batteries (not included)Up to 20 hours of continuous operating time Specifications:Blood Oxygen Saturation measurement range: 45 ~ 100%Pulse measurement range: 25 ~ 250 BPMBlood Oxygen resolution: 1%Pulse rate resolution: 1 BPMBlood Oxygen accurate measurement: 2% (70%~100%), Unspecified (45% ~ 69%)Pulse Rate accurate measurement:2 BPM Unit Dimensions:1.3 x 1.2 x 2.25-inches (H x W x D, approximate)Package Includes: Pulse Oximeter Operating ManualSoft carrying pouchLanyard strapAdditional Information: Notes:Model: JZK-302 Product Requirements:Two 1.5V AAA alkaline batteries