.Battery Backup – Up to 3 hrs. Output RMS – 100 RMS Watt. Trolley Speakers Wireless Mic – Dual Cordless Mic System, Guitar Input .Bluetooth , FM Radio , USB and SD card support. 2 Wireless Microphone Free with this speaker. .Can be connected with any audio/video device like Mobile / PC / Mp3 Player / DVD.Simply plug & play USB and SD card support. .In the Box : Power Cord, 2 X Wireless Microphone, Remote, Manual .Metal Grill Covered Speaker with Strong Steel Trolly Wheel.