INSERT with white center jack joins cables with plugs; Connects equipment with ports like a subwoofer, stereo receiver, or other equipment with component audio and video ports; Fits a standard opening in a wall plate for jacks COUPLER with female ports on both sides connects to an cable concealed behind the wall; Connect a subwoofer to the perfect location near an available wall plate STURDY SNAP-IN CONSTRUCTION of feed-through provides a secure connection; Re-usable jack inserts can be easily disconnected and relocated when upgrading or redecorating; Gold-plated connectors provide a reliable connection and distribute authentic audio and video Quick snaps in installation and easily fits standard wall plate, patch panel or box; Compatible with nearly all style wall plates COST-EFFECTIVE 20-PACK provides enough inserts to connect 20 sound system component cables Colour:Yellow+white+red Material:Plastic + Metal Package Contents: 20 * Jack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.