Sony DSXM55BT MP3/USB Marine Receiver Bluetooth + 2) 6.5" 140W Speakers White Sony Media Receiver provides powerful in-dash amplification Features integrated Bluetooth technology, and a front USB & Aux-In port This receiver is compatible with the iPod Nano 1, Touch 1, & Classic and iPhone 3G, 3GS, 4, 4S, & 5 6.5" Sony Dual Marine Speakers provide 140W of MAX Power and 65W of RMS Power Impedance : 4 ohms; Sensitivity (db) : 90 dB/1W/1m; Frequency Response : 45 - 20,000 Hz