Pyle PTHDL160 - USB Temperature and Humidity Data Logger - Built in Alarm for User Set Readings Quick & Easy Monitoring - Digitally Measures & Saves Temperature & Humidity Readings in Any Location Instantly Save, Recall & Review Data via PC Computer (USB Port Connector) - Temperature Range: -40 to 221F Programmable Recording Time Intervals - Alarm Function - Temperature Setting LED Light Alarm Indication Save & Record up to 21,000 Thermometer/Hygrometer Data Entries - Battery Operated (3.6V Included) Temperature Accuracy: +/-2% - Humidity Range: 0% RH - 100% RH - Humidity Accuracy: +3%