PopisThe OM-EL-USB-LITE is a low-cost temperature data logger that measures and stores up to 4080 temperature readings over a -10 to 50°C (14 to 122°F) measurement range. It has a fixed 30-minute sample rate and a battery life of 1 month with continuous use. Press the button and a red/green LED indicates whether a preset alarm level has been breached. The data logger is configured and the stored data is downloaded by plugging the module into a PC's USB port and running the control software under Windows 98/2000/XP. The downloaded data can be graphed, printed, and exported to other applications. A battery comes installed. To start logging, pull out the tab.