Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Does the electrical cord have 3-prongs? I need to plug it into a power strip, and it won't work it if only has 2 prongs.
Document: The clamp is very strong and therefore hard to work. This is good, though, since it really grabs the shelf it's mounted on. It's pretty cute. I would not try using a regular bulb with it because they stick out past the bottom of the shade and throw a nasty glare. We use a 9 watt CFL T2 bulb, which is only 3 1/2&#34; long. Even 9w is too bright for a bedside table. The 2700K bulb has a nice color.
The lamp works as I need it to. However, it has a relatively short cord which required the use of an extension cord. But I'm pleased with this purchase.
I give it a zero, lamp arrived 2 days after purchase , does not work. Tried different bulbs outlets etc. Waste of time and money
I purchased 3 of these lamps for my 3 kids,  two in blue and one in white. Who all like to read or color in bed. These were also Christmas presents and were purchased in early December 2013. After a week of placing them on the headboard of the beds just after christmas two out of the three did not work. Button on top just keeps spinning and will not turn the light on/off.
it's too thin and there isn't enough rubber to prevent it from slipping. it may suit the purpose, but still would have liked it to be stronger. if i could have i would've given it 3 1/2 stars. for what you get it should be 5 dollars cheaper. still okay. a lamp is a lamp.
This is just what I was looking for so I could read in bed.It is sturdy and the clamp fits tightly on my not woodenheadboard..  (which is about 3/4-1&#34; thick)
The clamp is good and strong. I love being able to plug it in, no batteries worries. It does get really warm when I use it.
I am very happy with this light, I ordered 2 and they both are well made. I would buy them again.
Exactly as described. A nice cheap clip on lamp with decent cord length and compact size. I'm using mine for building models as a extra spotlight and its fine. There are better lamps out there but not for this price
I love this light because it clips on thin bed rails or thick ones, but mine broke in 2 uses. The 'on/off' switch just spins now.
Answer: yes