Indoor temperature range: -4F to 158F (-20C-70C) Outdoor temperature range: -40C-70C Humidity range: 20%-95% Comfort index: dry, comfortable, humid Temperature display: optional C * F (default is C) Temperature resolution: 0.1C * F Humidity resolution: 1% Refresh rate: every 10 seconds Temperature error: 1C Humidity error: 5% Wireless receiving range: 60 meters High frequency: 433MHz Power supply: AAA battery (not included) Note: 1. Do not expose the device to extremely high or low temperatures, otherwise it may damage the electronic components and plastics. 2. When the LCD screen stops working, please replace the battery. 3. Do not immerse the product in water. Shop Tips: 1. The size is measured manually, please allow the error (1-3 cm). 2. Due to the different monitor pixels, there may be some color difference, please refer to the actual product.