If you are interested in our products,PLS add my SKYPE ID lillianchang0709 SP-5500 Description: Wooden case for whole set, including woofer and satellite speakers Infrared remote control and front panel control keys Digital LED indication Specification: Power Output:------------------------------------------------------RMS45W (20W+5Wx5) Subwoofer: ---------------------------------------------------------20W Satellite: ------------------------------------------------------------ 5Wx5 Speaker Driver: -------------------------------------Woofer: 5.25 inch; Satellite: 3 inch x 5 Subwoofer Speakers: -------------------------------------------20Hz-200Hz Satellite Speakers:------------------------------------------------100Hz-20KHz Separation: --------------------------------------------------------->=45dB S/N ratio: ------------------------------------------------------------>=75dB Packaging Master carton, Gift box, Remote Control, User manual, RCA cable, RCA to 3.5mm converter, Fuse,Batteries Option 2.4G Wireless technology for surround speakers FM radio function USB OTG, MP3, WMA playback SD/MMC Card reader Digital decoder with optical and coaxial input Bluetooth