About this item 4-Channel wireless audio transmitter/receiver system Enables easy wireless hookup for powered subwoofers & powered speakers Solves wiring problems quickly & easily. Note- for powered speaker hookup, you’re A/V receiver must have variable pre-amp out RCA jacks) Works with a/V receivers, Mac, PC, mobile devices & all other products with 3.55mm or RCA connectors No front-to-back of room wires or cables External antennas enable extended 80ft unobstructed wireless range & up to 60ft obstructed Includes self-adhesive Velcro strips, transmitter, receiver, 2 external antennas, 2 USB AC power adapters, 2 USB cords, 2 RCA to RCA stereo patch cables, 2 RCA Y-Adapter cables & two 3.5mm stereo to RCA cables