Features: 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. Note: °C display only, can not display ℉. Thanks for understanding. 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: 433MHz Update Rate: 60 seconds Transmitter Battery: 2 * 1.5V AAA Batteries(not included)  Receiver Battery: 2 * 1.5V AAA Batteries(not included) Transmitter Size: 6.6 * 5 * 2cm / 2.6 * 1.97 * 0.8in  Receiver Size: 8 * 5.5 * 1.7cm / 3.15 * 2.16 * 0.67in  Transmitter Weight: 28g / 1.01oz Receiver Weight: 38g / 1.37oz Package Size: 17 * 7.7 * 3cm / 6.97 * 3 * 1.18in Package Weight: 109g / 3.86oz Package List: 1 * Receiver 1 * Transmitter 1 * User Manual (English)