Thanks to the complete file transferability, you can easily enjoy the convenience and fun of accessing more music and photos via the USB and SD card slots.Make one easy connection and enjoy all your music from portable devices and computers. Simply plug your device to the AUDIO-IN (3.5 mm) port on your Philips set. With computers, the connection is typically made from the headset output. Once linked, you can enjoy your entire music collection directly, on a set of superior speakers. Philips simply delivers better sound.This Philips speaker has 50W RMS total output power. RMS refers to Root Mean Square which is a typical measurement of audio power, or rather, the electrical power transferred from an audio amplifier to a loudspeaker, which is measured in watts. The amount of electrical power delivered to the loudspeaker and its sensitivity determines the sound power that is generated. The higher the wattage, the better the sound power emitted by the speaker.