Easy to use; toolless (no soldering or screwdriver req.) modular RJ-11 Keystone jack. To be used with keystone wall plate or panel. WARNING! The current batch of these keystones have an incorrect wiring diagram on the cover (and in the current photos). The proper wiring should be; from left to right; white/green; blue; white/blue; green. We apologize for this error and are working to correct it as soon as possible. Note that the width of the RJ11/12 keystones is such that two cannot be used side-by-side in the same wall-plate. Monoprice continually strives to improve its product line to bring our customers the best products available. Therefore; changes may be made to listed specifications without prior notice. Item received may not match photo or specs shown. The color indicated can vary in tone and/or hue between production runs and manufacturing facilities. The color of this item may not be an exact match to any other product; even if they are indicated as being the same color; whether sold by Monoprice or any other vendor. Individual pieces may also vary very slightly in color from each other. Support Files: Dimensions Diagram (Jan 24; 2012)