Specifications Model TS FT004 BIndoor Temperature Measurement 0 60 °COutdoor Temperature Measurement 40 60 °CAccuracy 1 °CWireless Transmission Open Air Up to 100 meters 30 meters in most conditionsFrequency 433MHzUpdate Rate Every 60 secondsTransmitter Battery 2 1 5V AAA batteries not included Receiver Battery 2 1 5V AAA batteries not included Transmitter Size 6 6 5 2 cmReceiver Size 8 5 5 1 7 cmTransmitter Weight 28 gramsReceiver Weight 38 gramsPacking Size 17 7 7 3 cmPackage Weight 109 gramsFeatures 1 Displays both indoor and outdoor temperatures 2 Wireless transmission function lets you view outdoor temperature from the indoor receiver 3 Indoor temperature range 0 60 °C Outdoor temperature range 40 60 °C 4 High accuracy with 1 °C precision 5 Convenient for home office or warehouse use Package Includes 1x Receiver1x Transmitter