Features: 1) Compact size allows for easy portability2) PSP can be connected directly to the speaker through the audio plug on the stand, no need for extra lines. During game play, an audio line can be connected for more versatility3) The left and right speakers can be spread apart like a fan4) Use four AA batteries or outside adaptor5) Photo frame makes your Sony PSP more personalized6) The sound effect is perfect enough to enhance your music7) Enjoy and share the music with friends while traveling or during outdoor actvities8) Available in a variety of colors (white, silver)9) The speakers can still be used without a subwoofer because batteries inside provide for power supply10) PatentedSpecifications 1) Speaker: a) RMS power: 1.5 + 1.5W b) Driver unit: 28mm full range c) Frequency response: 200Hz - 18kHz d) Impedance: 4ohm e) Input voltage: DC 5V / 1.5Ah f) Magnetically shielded g) Dimensions (L x W x H): 75 x 55 x 127mm 2) Subwoofer: a) RMS power: 5W b) Driver unit: 2" woofer c) Frequency response: 50Hz - 250Hz d) Impedance: 8ohm e) Input voltage: DC 18V f) Magnetically shielded g) Dimensions (W x H x D): 86 x 82 x 118mm 3) Accessory: a) Switching adaptor (outside adaptor) i) Input: 100 - 240V, 50 / 80Hz, 0.6Ah ii) Output: DC 18V, 1.5Ah b) Audio input line: 3.5 - 3.5mm stereo port c) Holder (stand) for PSP producing area:China