"Thermal Imager has over 10,000 pixels to troubleshoot hot and cold spots. Adjustable emissivity from 0.10 to 0.99. Store and share images with optional microSD Card (sold separately). User selectable high and low temperature alarms from -4 to 752-Degree Fahrenheit (-20 to 400-Degree Celsius). Select color palettes to best capture the event. Rechargeable lithium-ion battery."--from Amazon.com.