Cobra 29LTD Professional CB Radio - Instant Channel 9, 4 Watt Output, Full 40 Channels, SWR Calibration SWR CALIBRATION - Ensure your antenna system is functioning at full strength giving you maximum performance for communication on the road. ANTENNA WARNING INDICATOR - Take the guess work out of checking your antenna, a light will automatically illuminate if your system needs to be checked. 4 WATT OUTPUT - Giving you the best range of communication with the maximum power allowed by law. INSTANT CHANNEL 9 - Immediate access to Emergency channel 9 to unsure you're driving safely from the very beginning 40 CHANNEL ACCESS - Scan the complete range of 40 channels for full coverage of CB stations.