Device for wind speed, airflow and gas direction speed measuring, Data Hold Function, Display illumination, Easy to set Area dimensions are stored in the meter’s internal memory for the next power on; Overflow Indication: “OL” will be shown in LCD; Low battery voltage indication; Back light function; Auto Power off; USB Interface & PC-Software; Size(H*W*D): 165mm*85mm*38mm, 9V battery, USB cable, PC-software.