Poly Planar MRR4 is a wireless remote control designed for use with poly-planar marine systems. It is waterproof and has a floating design, so you don't have to worry about it getting damaged if it falls in the water. The MRR4 has a range of 15 feet, so you can control your music from anywhere on your boat.

The MRR4 has a variety of controls, including buttons for power, mute, tuning, source, audio, band, volume, and presets. You can use the MRR4 to control the radio, CD player, and AUX input. You can also use it to adjust the volume, change the audio settings, and select presets.