The product is a set of two Lascar EL-USB-2-LCD temperature data loggers. These loggers can be connected to a computer via USB interface, allowing for easy data collection and analysis. They are ideal for monitoring and recording temperature readings in various industrial or laboratory settings. This lot of two loggers is perfect for those who need to track temperature changes over time and store the data for analysis or documentation purposes. I have no way of being able to test for function.