Transmitter Weight: 28g / 1.01oz Update Rate: 60 seconds Wireless Transmission(in open air): 100 meters, 30 meters under most condition Frequency: 433MHz Package Weight: 92g / 3.86oz Receiver Battery: 2 x 1.5V AAA Batteries(not included) Indoor Temperature Measurement: 0~60°C Receiver Size: 8 x 5.5 x 1.7cm / 3.15 * 2.16 x 0.67in Receiver Weight: 38g / 1.37oz Outdoor Temperature Measurement: -40~60°C Transmitter Battery: 2 x 1.5V AAA Batteries(not included) Package Size: 17 x 7.7 x 3cm / 6.97 x 3 x 1.18in Accuracy: (+/-)1°C Transmitter Size: 6.6 x 5 x 2cm / 2.6 x 1.97 x 0.8in Features: Please note: Only Meanure Celsius This indoor/outdoor thermometer brings much convenience for your daily life. Just put the receiver on the desk, you can know outdoor temperature easily. Can display the 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, a great item for home or office use What is included: 1 x Receiver 1 x Transmitter 1 x User Manual (English)