PYLE Meters PTHDL150 Temperature and Humidity Data Logger with USB Connection Selectable Measurement Cycle from 2 Seconds to 24 Hours - Alarm for Minimum/Maximum Values - Includes 3.6 V Lithium Battery, CD-ROM with Software Download Collected Data Through USB-to-PC Interface - Measuring Range: 0 to 100% RH, -40 to 70 C - Dimensions: 3.94-Inch H x 0.98-Inch W x 0.79-Inch D Analysis Software Runs on Windows 98, 2000, XP, Vista, 7 - Accuracy: +/- 2% RH, +/- 1 C - Weight: 1.13 oz Memory For Up To 16000 Readings - Memory: 32000 Measurements (16000 Each for Temp./Humidity) 2 LEDs for Status Information - Battery Life: 3 Years