The qtx qr5b speaker system is amaster/slave (active/passive) system that can be mounted on your ceiling orwalls. Two mounting brackets are provided toattach both speakers anywhere on a wall, keeping the speakers safe and soundwhile providing you with your desired sound. These speakers are ideal for at-home useand in small stores. They provide great background music in pubs and clubs. The active speaker can be connected to awide range of audio devices such as mp3 or cd players and laptops via the rcaline input. Together with the passive speaker, the qtx qr5b offers a 40w rmscapacity, ensuring quality sound for your entertainment needs. Theqtx qr5b wall speakers are especially suitable for home use with your pc and/oras a hi-fi speaker set.highlights active/passive (master/slave) speakersystem 2-way system: 5.25" (13cm) subwooferand 1" (2.5cm) neodymium tweeters for 2 x 20w rms total power supplied with mounting brackets blackchassisfeatures connections: active - 1 x stereo rca line input, 1 setof speaker terminals passive - 1 set of speaker terminals 2-band eq - (adjustable bass and treble) adjustable volume metal speaker covers sensitivity: 89db frequency response: 32hz to 22khz 250v, 1a fuse power supply: 230v, 50hzdimensions each box: 7.1 x 9.4 x 5.9 inches (18 x 24x 15cm) (w x h x d) weight - active speaker: 7 pounds (3.2kg) weight - passive speaker: 4 pounds(1.8kg)included 1 x active speaker 1 x passive speaker 2 x wall brackets 1 x speaker cable 1 x british power cable 1 x german power cable