Reaction speed block, receiving and transmitting signals is very sensitive. Features: Transmitter Material:Glass-Fiber PA Dimension:210152128mm Weight:980G (without batteries) Protection Class:IP65 Frequency range:VHF: 310331MHz; UHF: 425446MHz Transmitter power:Less than or equal to 10dBm Safety code:32bits (4.3 billion) Temperature range:-4085 degrees Celsi.