fingertip oximeters, oxygen meter alarm function 2.4inch Color TFT display PULSE rate and SpO2;All the trend and list for review;Lithium battery, can be connected with PC to recharge.;With USB port, can be outputted data to computer; With a memory, can store 100 case history;Alarm function, can set up the high limit and low limit. pulse oximeter KN-601E fingertip oximeter