They  look like normal Hi Fi speakers, built amplifier and mixer just plug in and play 

A pair of speakers no bigger than your average book shelf Hi Fi Speaker  Dimensions (H x W x D): 420 x 253 x 249mm 

With awsome sound output much clearer and responsive than a normal hi fi speaker.

Connect a karaoke machine, an Ipod, or Turntable for superb sound.  No need for a mixer as the bass , treble and volume controls are on the rear of the speaker.

2 speakers are included, one of them has an inbuilt mixing amplifier that powers both speakers so only one mains cable is required. The other speaker is simply connected by a simple push in and click connector.