describe Color: Neutral black Size: 5*3.4*9.6 cm This product can be hung on the wall or placed on the table< /p> RF transmitting frequency 433.92 MHz Transmission range of 60 m in open area This product is used for temperature measurement exterior and has good water resistance. Batteries: 2 AA (battery not included in the package) The outdoor temperature sensor with wireless sensor Built-in wire can operate up to 60 meters in open space. The ultra-long wireless transmission distance brings great convenience to your installation and operation. The outdoor temperature sensor has a good waterproof function, which is very suitable for outdoor working environment. . The outdoor temperature sensor is small in size, light in weight, and does not take up much space for installation. The outdoor temperature sensor with bracket and mounting holes suspension on the back can be easily mounted on the wall or placed on a table. The outdoor temperature sensor is battery powered, has no power cord limitations, and is easy to install. The 433.92 MHz frequency outdoor temperature sensor is specially designed for Fanju weather station. Up to three outdoor temperature sensors can be connected to a weather station.