Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Does the plug barrel have 1 center pin, or 5 pins?  The last adapter/cord I ordered that was 'compatible' w/ my dm1z-4200 CTO had only 1 pin.
Document: I have ordered two of these and returned both. The plug is suppose to have a ground on the outside of the sleeve and it does. It is also suppose to have voltage on the center pin and the inside of the sleeve connector. The Center Pin does have power but the inside of the center sleeve does not and this is where most HP and Compaq PCs get their power from. I found another seller on here that sold a true HP OEM replacement for less than a dollar more and it works Perfect. I still use Anker for their Laptop batteries and some of the other chargers for different models but will not purchase this model again.
When my HP Pavilion DV5 battery charger failed I ordered one from a different company and it had the short cord mentioned in other reviews, and it failed after a month. The battery was also shot so I thought maybe it overworked the charger and got it hot. I installed a new Anker laptop battery and also purchased the Anker AC Adapter and Power supply. It arrived on time. It is charging properly and it also seems to be a better quality then the last one. This has a longer cord, like the original supplied by HP.
I recieved this yesterday and am VERY happy with it. I first started with the original manufacterer battery and it started losing charge because the metal was bending out and eventually detached. I then ordered one from a diffeent company trying to save some money. BIG mistake because after only 3 weeks that one started losing charge and every time I plugged it in it would spark I thought I was going to start a fire or electricute myself and the cord was too short and much thinner. This one is perfect no sparks, and long enough for me to let the adapter sit on the floor when im laying on my bed and the cord is thicker and hasthe 3 prong which I think will last longer.
Instead of paying attention to model compatibility, first check the output. You want to make sure your output will be the same (3.5A 65W or 4.74A 90W, etc). Once you have confirmed that, then check the input plug/model. The reason I say this is that I ordered on for my HP dv6 which from the description says I need the 3.5A power supply; however, once I received the power supply I realized I needed the 4.74A.These power supplies get hot in temperature which isn't so good because computer components don't last in heat so be prepared.
I purchased two of these AC adapters for both a Compaq CQ50 and CQ60 Laptops as the description said it would support these models. Neither of the AC adapters worked and both were very loose fitting and did not seem to fit properly. The AC adapter were rated at 18.5 volts but were only putting out 18.1 Volts. I would not recommend this brand to anyone. I would return both of these items but my daughters have thrown away the packaging.Again BEWARE!
I ordered this for my HP Pavillion DM1z but it wouldn't charge. Turns out there is a dash number after the DM1z that matters. The DM1z-3200 I have requires a 90W charger. According to the HP website only the DM1z-1000 series can use the 65W charger. Other than that, great service and the charger seemed like good quality. It just didn't work for me.
This adapter worked great. After 10 months I shipped my computer off to be repaired & it was sent back with a new HP cord. The HP cord gets hotter than Anker, sparks when I plug it in and is loose at the computer so it constantly disconnects. I would highly reccomend Anker over HP any day.
I think you'd be hard-pressed to find a better 65w replacement adapter at this price point. I'm interested to see if mine only lasts the six or so months others have experienced.The plug fits my HP laptop better than an HP branded replacement adapter I bought to use then return from Best Buy while I waited for this to ship.Even if it does last six months, who cares it's $15?UPDATE (8/27/2012):The adapter is still working but the connection where the adapter plugs into the computer is now sketchy and requires a lot of jiggling the connector and an inability to move the laptop or there is no connection between the adapter and the computer.
I ordered this adapter in March and it stopped working a few days ago during the last few days in July. For the first four months, I had no complaints (sometimes the adapter would get very hot but wasn't a big deal for me). However, in the last few days of its life, it would charge for a small amount of time and then stop. If I wiggled the connector around a little bit, I could sometimes get it to work again. Now, it has completely stopped working. Very disappointed that this only worked for four months of use.
I purchased the Anker Laptop AC Adapter and Power Supply because the price was so incredibly reasonable. I was hesitant at first, but after doing much research for an affordable replacement I decided that I would give this a try. The cord isn't quite as long as the original one that came with my laptop and doesn't seem to be as thick, but I can say it works just fine. I began using it the day I received it (which by the way was delivered one day after I ordered it, and I did not pay any additional delivery charges).
Answer: Tis a center pin.