The VSA150S active/passive speaker kit features an inbuilt 1000W amplifier that offers an improved sound quality. It also makes this set plug-and-play as it instantly powers the passive speaker when connected with the included NL2 cable, allowing high-quality stereo output to serve medium sized venues. With an inbuilt Bluetooth receiver, this active speaker package enables wireless audio streaming from your smart devices in order to access any audio you want from websites and applications. Alternatively, it features an inbuilt MP3 player for automatic playback of audio files stored on USB sticks which can be connected to the corresponding reader.