High quality auto car radio antenna extension cable with amplifier This digital TV antenna is waterproof with built in amplifier (ANALOG ANTENNA and digital antenna) Power supply electric voltage:DC 5V or 12V Electric current:60~100mA Work frequency: VHF 170-230MHZ UHF 470-860MHZ Increase a benefit: 25 dB Voice coefficient:≤ 7 dB Output resistance:75 Ω Halt wave:≤ 3 Work temperature-20 °C~+85 °C Keep temperature-40 °C~+90 °C