New in an Open Box. Connectivity Technology: RCA, Bluetooth, Auxiliary, USB. Controller Type: Push Button. Compatible Devices : Tablet, Smartphone, Speaker. Connector Type : RCA, USB. Audio Output Mode : Stereo. Output Power : 45 Watts. Number of Channels : 4. Wireless Audio Streaming – Play Spotify/Pandora music to stereo system via Bluetooth pairing through smartphone, tablet etc. Marine Environment Friendly – IPx6 water splashing protection, Plastic with UV coating, Square Opening (mounting template included), Conformly coated circuit board. Power, Inputs & Outputs – Peak 40W x 4 channels with rear USB 2.0 & Aux input as well as RCA output for external amplifier.