IKM-100 wireless portable sound system is an invaluable tool for teaching, presentation and public speaking. It can be used both indoor, such as conference rooms, meeting rooms, auditoriums, and also for outdoor. For indoor use, use the power cord and simply plug it into a wall outlet; for outdoor use, the system runs on two 12V rechargeable batteries, which can last well up to 10 hours based on the volume setting and features used.It comes with a fully-featured remote control and wireless microphone. The transmission range can be as far as 300 feet. For your convenience, there are two additional audio inputs (standard 1/4") that can be hooked up with wired microphones. Speaker system is composed of one 50 watts amplifier, one 6" woofer for clear, powerful sound.IKM-100 Powerful Speaker System also Looks as Good as it Sounds. Turn on Power button to "ON", insert SD card or USB device to play MP3 format songs directly.Warranty : 1 year provided by Comsis Computer which means we will be your direct contact for waranty exchanges.Applicable Scope: Outdoor (especially suitable for dancing), Conference, Classroom, Military training, Guide, Sales promotion / Public sales, Small-scale performances, Exhibition...CONTENTS:Base Unit, Remote Control, Power cord, User"s manual, Wireless MIC