Shark Shkmsm2050k Motorcycle , Yacht Boat 2 Speakers - Amplifier ,  Radio Usb  Sd , Wireless Remote chrome 100 watt motorcycle audio with 2 waterproof speakers. FM, SD, aux input Channel separation &gt;45dB Frequency response 20Hz-50kHz Sensitivity 50mv SLIM WIRELESS REMOTE CONTROL INCLUDED Frequency range 87.5--108MHz Dot Matrix LCD FM frequency display Usable sensitivity 5 v at S/N 26dB Fuse rating 5A USB Port: support USB 2.0 SD slot: support 128MB,256MB,512MB,1GB,2GB/4GB Details for loudspeaker Mirror brackets included for easy installation, easy to read lcd screen Working Voltage 10-16V DC MAX power @ 4 50WX2 Wireless Remote SD slot, usb device on the amp RMS power @ 4 25WX2 THD 75dB