"Plug this IR emitter into a 2-conductor 3.5mm keystone jack and stick it over the IR eye on your A/V equipment. The emitters operate on 12VDC and are compatible with most other IR devices. Put your components where they belong, not where you see them! Features: Control A/V devices located behind doors or in other rooms. Use with 2-conductor 3.5mm keystone jack. 12VDC operation compatible with common IR devices. Cable length is 10ft."