Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Could I place this on an extension cord that has two sconces plugged into it?
Document: What is great about this dimmer is you can install it on any standard lamp corded lamp to make it dim able. All one  needs to do is simply cut the cord where you want to place the switch and insert the ends into the switch and push two small buttons down to lock the cord in place.
Like others have said prior, this is very easy to use; cut cord in desired spot, slide into switch & put pegs back in=that's it! It says in the instructions that it fits SPT-2 cord which if you're wondering is 16-18 gauge wire (many extension cords are 16 gauge and what I used it on).The so called nightlite is a non-issue for me. How anyone could rate this any lower than a 4 is beyond me.
I use lamp dimmers throughout the house, and this Lutron is one of the best I've tried.You install the dimmer right into your lamp cord, so you don't have a separate wire hanging down -- as with standard lamp dimmers. If you don't need to adjust your dimmer frequently, you can place it closer to the plug end of the cord. This way, it's out of sight.
It feels unnatural to cut the cord of a lamp you like, but installing it is so easy a 5 year old could do it; all you need is a pair of wire cutters. It also works perfectly as expected for a dimmer and you can put it at any level you want. They should all be this easy.I haven't had it for a long time, so I don't know if it will crap out or not, but this device is so simple I don't expect that to happen.
I replaced CFLs with LED bulbs in a couple of table lamps. The LEDs that I bought are dim-able, which led me to this item. This could not be easier to install. Cut the lamp cord, push the ends into this dimmer, press the buttons that secure the cord inside the dimmer. A pair of scissors is all the tools you need. The lamps can now be adjusted to whatever brilliance I want. Really worth the price.
I was quite skeptical when I received this and read the instructions. I would have been much more comfortable handling the wiring internal to the unit myself, but I'm very impressed with the results given how simple the installation was. All you do is cut the cord where you want the switch and snap the two ends into the unit. The whole process probably took me no longer than a minute. It seems solid enough to stand the test of time, too.
Super easy to install - took a total of 90 seconds! Works just as advertised! No problem inserting a standard size lamp cord! Will buy again if I require a lamp cord dimmer.The only advice is to read the instructions to properly align the cord associated with the large prong of the plug with the proper position on the dimmer!As always great shipping service with Amazon Prime. Asked for two day and received overnight!
So I'm not frequently turning the dimmer from high to low. (I'm also a fan of pink bulbs, and they don't come in low wattage -- 60 is about the lowest. With the Lutron dimmer, you can adjust your pink bulb to whatever intensity you want. I'm usually shooting for a soft, low light. )I was also pleased that installation is a snap. It's a little off-putting to cut your lamp cord in two, but it works out fine. Installation couldn't be simpler.
It took literally 3 minutes to get this dimmer installed on the cord and operational. It is so ridiculously easy to install. You don't even need to strip wire. The dimmer itself was used to replace a soldered on dimmer on a Pablo Tube Top table lamp. The dimmers on all those lamps fail prematurely. I have three of the lamps and two had dimmers go within months of one another. This dimmer is nicer and smoother to operate. Plus it is a 300W versus the failed dimmer which was 200W.
In this case it was worth the extra few cent so I could see it and hold it in my hand!
Answer: yes