The P1 Marine Source stereo from Polk Ultramarine comes app-ready, Bluetooth-enabled, and Sirius XM-compatible. The two-part modular design includes a waterproof helm control with a 4.3-inch full-color TFT display, and a waterproof hideaway module. You can also control the sound system with your Apple or Android device, thanks to the P1’s app-ready technology. Connection options include auxiliary line-level audio input, USB or Bluetooth. A NOAA weatherband tuner keeps you ahead of the weather.