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Question: What is the length of the cord on this warmer? I purchased a warmer locally & returned it due to the cord only being 18 inches long.
Document: I like it. The cord is plenty long enough so that I don't have to use an extension cord or sit within 18 inches of an outlet. (cord really truly is 5 feet long) I did put mine on a outlet timer to ensure that the thing isn't left on at night however due to accidently finding it on a few mornings. The light is not bright when it is on. This thing gets hot enough to sizzle water drops that land on it after it's been on a while. My adventurous male cat learned very quickly not to ever walk on this thing again.
I'll start with some specs since Amazon isn't always good at providing them. The cord length is about 68 inches. The flat surface for the mug is 3 5/16". The switch and indicator are on the base (not the cord). The watt rating listed on the warmer is 17 watts, although my Kill-a-watt meter shows it drawing 12-14 watts, depending on the line voltage. There are less expensive units for sale here, but I chose the Mr. Coffee unit because of the longer cord length and the switch and indicator on the warmer rather than the cord like some models.
The heating surface of the Mr. Coffee is 3 3/8". Overall dimensions:  5 3/8 inches front to back, 5 inches width. Cord length is 5 feet 6 inches. It has a simple, sliding on-off switch and an orange on-indicator light.Heat transfer from the heating surface to the fluid depends on how much contact between heater and container there is and a flat-bottomed glass or cup is best. For this review I used a Bormioli Rocco Bodega Tempered Glass Tumbler (ASIN  B000PGB9PE) which has a flat bottom and holds 12 oz of fluid filled to 1/2 inch from the top rim.
I have yet to read a review for one of these types of coffee cup warmers that stated it keeps hot beverages hot.I bought this unit due to it's cord length and the fact it plugs into the wall, rather than a USB port. Most of the reviews on other units said the cord was either too short or the USB power was insufficient to keep the beverage warm.With that said, this unit will not keep a full cup of coffee hot. It will keep it warm. Half empty it will be better and a quarter full it gets nice and hot.I even bought a few 2-inch, steel washers to put on the plate.
I purchased the Mr. Coffee mug warmer because it was economical and I believed Mr. Coffee to be a reputable brand.Don't waste your money on this mug warmer, even if it's economical. There are good points -- nice length to the cord; convenient on/off switch. But the reason for purchasing a mug warmer is to keep the contents warm, even somewhat heated. This warmer does not do that. It barely keeps the coffee lukewarm. I previously had a warmer by Continental Electric which kept the coffee at a very nice temperature and it was never cooled to the "tepid" point.This model is not worth the money or effort.
I have looked around locally for a mug warmer but could not find one until I went online to Amazon. This is a very nice outfit for the money. Has long enough cord; and it is wide enough for  the big mugs. It keeps the coffee, tea, cider hot until it is all gone. My wife is very pleased with it.
For those who like measurements. Mr. Coffee mug warmer purchased in Jan. 2014 has a 5.5 ft cord length, 3.25 inch maximum diameter heating surface. This allows for a regular mug (3 inch) but not the larger soup mugs (3.5 inch+), although the box says it is for heating soups. The unit is rated at 17 watts heating capacity.For the surface temperature heat up rate of the mug warmer, I used a laser/IR thermometer. The following readings are minute/degree F temp.
Mr. Coffee mug warmer: As I use it, I will update this review. Cord is long (3.5 feet), the actual heating surface is 3 and 3/8 inches diameter, and it's well made and inexpensive. It turns on with a red light on the unit (unlike another brand that has the on/off switch on the AC electric cable). A superb substitute for schlepping my soups in with a thermos every day (hard to clean, extra work at home, etc. )My goal: warm soup at my desk.
After years of bouncing up and down to the microwave to rewarm my coffee I am so excited about this little warmer. It works great and keeps my coffee warm all the way to the bottom of the cup no matter how long it takes me to drink it. I dont know how I lived without it for so many years. One thing is for sure, if this one ever gives out I will certainly buy another. The cord is the perfect length also.
Amazon was the seller. I got one for myself for work, and another one for a gift for someone else. The cord is plenty long. The on/off switch is on the unit (right where it should be), and the little red light is handy to confirm that is "on".The diameter of the heating pad itself is 3-3/8 inches from inside edge to inside edge. Other people have measured 3.6 inches, but that is from the outer edge to outer edge (i.e., the edge is beveled).
Answer: Hi, the one I have measures at 67 inches long. Hope that helps.