the underside of your scanner will show the correct voltage for your devise and the correct polarity. the sr900 is direct current at 12 volts with the pos. in the center. it will run off your car cigarete lighter if that helps.
Programming the Cobra SR900 Power the scanner up. Use the "manual" key to select the channel to be programmed. Press the "E" button, then enter the frequency (you want to program in) and press the "E" key when you are done. Press "manual" to select the next channel and repeat.
Programming the Cobra SR900 Power the scanner up. Use the "manual" key to select the channel to be programmed. Press the "E" button, then enter the frequency (you want to program in) and press the "E" key when you are done. Press "manual" to select the next channel and repeat.
Press the manuel button then press the channel number you want to program and then press the manuel button again. Press the frequency numbers in t\and then press the "E" for enter. Now your police scanner is programmed. :)
There's no need to delete existing programming. Enter a new frequency on a channel and it will replace the existing one. T program the scanner, Power Up Press manual Press 1, manual to go to channel 1 To program 155.250 in to channel 1 Press 1, 5, 5, .(decimal), 2, 5, E/enter Press manual to advance to the next channel, repeat above for each channel and frequency Press scan to scan the programmed channels