Pyle PLMRB29B (Marine Bluetooth MP3 Stereo Receiver) This single-DIN, in-dash head unit features built-in Bluetooth for wireless music streaming and hands-free calling via an integrated microphone. It also includes AM/FM radio, USB/SD card readers, and a 3.5mm auxiliary input jack. Pyle PLMR51B (5.25" Dual Cone Marine Speakers) 100 Watt, 5.25-inch, 2-way, full-range speakers designed for marine or car use. They feature a polypropylene cone with a cloth surround and a molded ABS plastic basket for durability. Pyle PLMRA400 (4-Channel Waterproof Power Amplifier) This is a 4-channel marine-grade amplifier with a dual MOSFET power supply. Also included speaker wire, radio antenna and amplifier wiring kit.