Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: How long is the power cord, and if need be can an extension cord be used?
Document: Plugging the units into dedicated wall outlets brought a welcome 'ping' as the control unit booted up. Within 10 seconds the fans and compressor awoke with a default setting of 70 deg and on the highest of three fan speeds. One excellent feature which many overlook is the overload detector in the unit's power plug. It incorporates not only a circuit breaker but also a thermal detector. We found this out because we temporarily used a HD 10' extension cord as a hook up. Bad idea!
Also, the insulation board helps block out some noise and heat. Plan on doing this procedure for those reasons. The cord is of ample length and has a safety plug that will cut out if there is a power issue. There is a reset button on the plug.
The air conditioner is new, arrived in good condition, was easy to install, contained all necessary parts and is quiet & efficient in operation. It gets the job done. It appears that the standard electrical cord length that comes with all window units is 6 feet, as with this unit. We needed a 9 foot cord to reach the outlet, so a 15 amp extension cord was ordered at the same time. The shortest length of (heavy duty)  extension cord that I could find was 9 feet.
My landlord recently installed one of these in my apartment. The overall build quality seems typical of similar size units. There's a lot of plastic parts that can vibrate and rattle against each other. The seals (or lack thereof) between the inside and outside of the unit are very poor and could use a lot of extra foam. Installation is tricky with the power cord coming out the bottom and a non-flat bottom to the unit.
This made installation super easy as I didn't need to frame a new hole. Also, this unit is set to energy saver mode and low fan speed and it only turns on every so often and when it does it's very quiet. I'm sure there's a large power savings over the old model which ran 24/7. It keeps the server room at a nice constant temp. Very nice.
I've owned an exact model prior to this one and was very pleased. The original model lasted 4.5 years before motor and mold problems at the end of August but the unit was heavily used. I purchased this new unit in September 2012 (knew I would need it for another 6 weeks of hot,humid weather), received it quickly but the item arrived damaged. It was NOT damaged in shipping as the box was not damaged in any way.
I really don't need the confirmation that I clicked a button on the remote or the panel. A toggle switch would be a nice feature, but I may have to rip it apart and find the speaker making that noise.
Great product. Works really well. Although I don't have it a long time... It has been cooling a big room really well.
The units both arrived in outer boxes with the regular box inside. There was no damage to either one and there is a small bag of hardware included. Read and follow the installation directions and soon you will be a cool and happy camper! I see no reason not to recommend these to anyone in need of a decent window unit, especially for the price.
For how well it works it is super quiet! That said, you need to remember it's an AC, it's gonna be a little loud, but for how cold it can make your place it's worth it! I also love the energy saver mode. It has made a noticeable impact on our electric bill. It also fills a pretty good size room. Love the remote too, and it's super easy to clean. I honestly have nothing negative to say about this AC...
Answer: The cord on this unit is six feet in length.  The cord is 71" plus the length of the cord cap gives you the extra inch.  Manufacturers often frown on the use of extension cords but if one is required, use one that has 14 gauge or larger wire and keep it only as long as needed.  A good example of this is the Coleman Cable 3531 14/3 General-Use Appliance Extension Cord, 3-Feet found at  Coleman Cable 3531 14/3 General-Use Appliance Extension Cord, 3-Foot