The LINDY Modular AV Face Plate System allows you to create your own custom face plates by using a combination of Snap-in Blocks and Keystone modules. Fit this 3.5mm stereo Keystone into a Keystone Snap-in Block and place into a face plate along side other Keystone and Snap-in modules. These modules provide a full range of solutions for AV, networking, voice and audio installations. The wide selection of modules and face plates can be custom configured giving you greater control and flexibility. Additional products required... Please Note:The LINDY Modular AV Face Plate System must be used in conjunction with LINDY Keystone Snap-in Blocks and Face Plates. Place this Keystone into either aSingle Keystone Snap-in BlocksorDual Keystone Snap-in Blockswhich come in packs of four. Then use with aSingle Gang Face PlateorDouble Gang Face Plate.