Turn you Handheld into a 40 Watt Mobile VHF 136-174 Mhz. Unscrew your antenna, screw on the connector and with a roof mount, or Mag Mount Antenna, you now have a 40 Watt Mobile. You can also use a Mag Mount and Cigarette Lighter Plug (included), and have a setup you can move from vehicle to vehicle in just a few seconds. The top of the unit says 35 Watts, but we have consistently gotten 40 Watts using a KNG P150s. This model is the “D” version that works with Analog and Digital Portables. Comes with a cable to interface with All VHF BKR Handhelds.