The CMP31 allows you to remotely control all functions of Standard Horizon fixed mount VHF that have remote capabilities. The full dot matrix display and programmable keys make operation simple and fast. Additional features include turning the radio on/off and all DSC functions including Distress. When connected to a GX3000S or Quantum series, the remote station also controls the 30W PA/Hailer functions. The CMP31 can be extended up to 70 feets using the CT-100 23 foot extension cable. The CMP31) is backed by and industry leading 3-year waterproof warranty.