This product can be hung on the wall or placed on the tableRF transmission frequency 433.92MHz60m transmission range in open areaThis product is used for outdoor temperature measurement and has good water resistance .Battery : 2 AA (battery not included in package) Outdoor temperature sensor with built-in wireless sensor can work up to 60 meters in open space. Ultra-long wireless transmission distance brings great convenience to your installation and operation. The outdoor temperature sensor has good waterproof function, which is very suitable for outdoor working environment. The outdoor temperature sensor is small in size, lightweight and does not take up much space for installation. The outdoor temperature sensor with bracket and hanging holes 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 one weather station.