Pyle PLUTVA102 Waterproof Dual Wakeboard Speaker and Amplifier Sound System Kit, Includes (2) 4'' Marine Grade Speakers Weatherproof Power Amplifier and Dual Speaker Sound System Kit, Includes All Necessary Cables Includes (2) 4'' 2-Way Wakeboard Mountable Speakers, Marine Grade Waterproof Construction 1.0" K.E.I.S.V. Voice Coils, 1.0" PEI Dome Tweeters, 2-Channel Power Amplifier, Volume Controller Amp: 2 x 100 Watt RMS @ 4Ohm, Waterproof 3.5mm to RCA Adaptor, RCA Line Input Connector Connect External Devices like iPhone/Smartphones, iPod/MP3 Players, Tablets, etc., RCA Line-in