Shark 1000 Watt 4Ch Motorcycle Boat Audio System with 2 Remotes, FM, SD, USB , Bluetooth , SHKC6800SME (Black) 4 channel 1000 watt motorcyle audio system allows 2 systems to share imput Everything is the system is 100% waterproof except for the amplifier Great for golf carts as well. This system has 4 channels that allows for 4 speakers (that are all included). Built in Bluetooth so you can connect to any gps, phone, mp3 player wirelessly. Just keep your phone in your pocket and connect. , Crystal clear FM reception with included waterproof antenna, sd slot, usb slot.