i-i44UHH Specifications STATION SPECIFICATIONS (S81120) Indoor Temp. Range: 32'F to 99'F (0'C to 37°C) Indoor Humidity Range: 10 to 99%RH Power Requirements: Primary Power: 5.0V AC Adapter (included) • Battery Backup: 2 "AA" Batteries (sold separately) Station Dimensions: 3.77" L x 1.14" W x 7.01" H (9.6cm L x 2.89cm W x 17.