This is digital waterproof TV antenna with built in amplifier optional Cable: 3 meters/ 5 Meters optional Power supply electric voltage:DC 5V or 12V Electric current:60~100mA Work frequency: VHF 170-230MHZ UHF 470-860MHZ Increase a : 20 dB Voice coefficient: 5-20 dBi Output resistance:75 Halt wave: 3 Work temperature-20 deg C +85 deg C Keep temperature-40 deg C+90 deg C