XO Vision RFM998 PLL Digital FM Transmitter [Electronics] High reliability from digital PLL synthesized system, Automatic radio-antenna cut-off & connect system Automatic frequency adjustment from micom, FM frequency selecting external switch Compact size & light weight, Low noise gold-coated RCA jack, Operational Temp.: -20 to +80 degree celcius DC 12V Operation, Power: DC 12V (+) / 30mA, Frequency: 87.9 / 88.3MHz