La Crosse Technology WS-8610U-CH Wireless Data Logger Wireless temperature/humidity monitor with remote sensor, Atomic Clock and PC uploading capability Uploads to PC with COM port connection; radio-controlled time and date Logs up to 3,000 sets of humidity and temperature data with time and date stamp Displays indoor temperature/humidity, outdoor temperature/humidity and dew point Swiss Precision Sensor Actual Size: 5.07 by 4.1 by 1.16 inches