Features: Accurate measurement in 0.05% Low perfusion Index,the word leading production in the movement environment Provide the parameter of PI( Perfusion Index 0.05%-20%) Accurate measurement in all kind of extreme environment measurement such as neonatal and shock patients Easy operation by 3.5'' color TFT Support audio and visual alarm,support to set alarm upper and lower limit values Lithium ion battery power supply Optional Charging dock https://un-medical.en.made-in-china.com/product/myqnHOedlVcI/China-Portable-Medical-Veterinary-Hospital-Pulse-Oximeter-Vital-Signs-Monitor.html