It comes with a compact power supply and an RCA cable / jack 3.5. You can also connect jack 3.5 / 3.5 jack (not supplied).
Once powered and connected to your amplifier or any audio equipment with RCA or just AUX (3.5 jack input), even a PC speaker kit with an AUX is the case, the pairing with your phone, tablet, or laptop is a 15 "(quick and easy and instructions provided).
It'll just start listening to your phone or tablet, and sound pass directly on the amp or speakers, and cut your mobile device.
In practice, there has been no perceptible latency, and what the scope is like any Bluetooth, a range of 7-9 m, with a "contact" as direct as possible (without obstacles) between 2 devices. For accuracy, to change the source must re-pair your device (15 "yet).
In the end, no need to have a dedicated Bluetooth speaker and often limited to play your mobile music, you can also use your favorite audio equipment for more power, more flexibility, more discretion and more freedom.
Viva La Liberta!