This indoor/outdoor thermometer brings much convenience for your daily life. Just put the receiver on the desk, you can know outdoor temperature easily. Features: Can display indoor and outdoor temperature. Wireless transmission function, you can know outdoor temperature with indoor receiver. Indoor temperature range: 0 ~ 60 C; Outdoor temperature range: -40 ~ 60 C. Very convenient, great item for home or office use. Specifications: Indoor temperature measurement: 0 ~ 60 C Outdoor temperature measurement: -40 ~ 60 C Accuracy: (+/-)1 C Wireless Transmission(in open air)): 100 meters, 30 meters under most condition Frequency: 433 MHz Update rate: 60 seconds Transmitter battery: 2 * 1.5V AAA Batteries(not included) Receiver battery: 2 * 1.5V AAA Batteries(not included) Transmitter dimensions: 6.6 * 5 * 2 cm / 2.6 * 1.97 * 0.8 in Receiver size: 8 * 5. 5 * 1.7 cm / 3.15 * 2.16 * 0.67 in Transmitter weight: 28g/1.01 oz Receiver weight: 38g/1.37 oz Package List: 1 * Receiver 1 * Transmitter