Gauge Size Waterproof Marine Stereo GP1 The GP1 is a waterproof standard gauge size marine stereo, ideal for installations with limited dash or panel space or to match existing standard gauges on your dash or panel. Features: Supports Bluetooth Audio, USB, MP3, AM/FM, AUX Standard gauge size USB device charging AM/FM radio with 30 presets (US & Euro) Waterproof (IP65) Rotary Knob Control Built-in 288W amplifier Connect up to 8x speakers Standard Gauge Size – Our smallest stereo yet, designed to sit alongside standard dash gauges, but still packing a serious Aquatic AV feature set.