dc 3 4v wrist worn pulse oximeter

{"cid":"91211028","title":"3.7V Batteries Wrist Based Pulse Oximeter Detect Sleep Quality","imgUrl":"https:\/\/img.chinax.com\/nimg\/07\/e7\/962162333dc3a8ebd9e269f5aed3-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"BERRY","Model Number":"BM2000A","Minimum Order Quantity":"1 PCS","Delivery Time":"15 days","Certification":"CE0123 , ISO13485 , FDA , FCC , RoHS","Place of Origin":"Shanghai","Supply Ability":"1000\/day","Packaging Details":"68*58*20mm","type":"Sleep Apnea Screening Monitor","Model Number:":"BM2000A","Color:":"White +Blue","Application:":"home sleep test for sleep apnea","Size:":"68x58x20cm","net weight:":"50g (without sensor and wrist srap)","Qualification:":"CE, FDA and other certifications","Display mode:":"OLED Screen","Type Of Battery:":"3.7V Rechargeable Lithium Batteries","Working Voltage:":"DC 3.4V - DC 4.3V","SpO Measuring Range:":"35 - 100%","Charging time:":"2 hours","Using time after full charge":"20 hours","data":"Inner flash memory for data storage","USB":"Includes USB Cable for charging"}}