What is the power source? Plug in or internal battery?
1595574
plug into household current. Have used it all winter, spring and very pleased with the purchase. Have stone countertop and foods cool so fast. we keep plates warming while meal being prepared and then put place on quilted placemats. rest of foods stay warm on it throughout the meal.
1595575
PLUG IN, if you read my review..... I thought this product was not good. it got too hot and the metal top was not heavy enough to stay flat, it molded to the heating element inside and was a wavy top.
1953976
You can use either power source. It comes with an AC adapter. I purchased a separate battery pack for travel.
1488543
It uses an internal non removable battery,like an ipod or mp3 player.It charges via USB.
503636
There is no internal batter in this unit. It does have to be plugged in to receive power.
1284957
It is powered with a USB cable and plug that they provide. You can leave it plugged in all the time or let it run off the internal battery and just plug it in to recharge the battery. Some functionality is sacrificed if run off battery power to conserve power. I'm going to see if I can cut off one end of the usb cable and permanently wire it into the vehicle.
239532
It is powered by an included wall wart plug. It runs on a lithium battery (internal) for hours when not plugged in.
877067
The internal battery is recharged through a charging stand/cord. The battery is non-removable.
809741
Battery is internal you plug the whole thing into the wall... It has the regular outlet plug like a lamp.
472271
Power source is an internal Li-Ion battery that is recharged when the unit is plugged into the computer USB port
1212827
No man, it doesn't have an internal battery sadly. By portable they just mean self contained. Its quite heavy though. Slightly awkward to lug around. Great speakers though. Definitely worth the price tag IMO. You will need a 110v power source to operate them at all times though. You can run it on a car battery with the 12v adapter. Gotta leave the vehicle running though or it'll drain it fast.
1895156
Both... You have to plug it in an electrical outlet as well as through the USB port.
1674683
It has an internal battery and you recharge via USB either plugged into computer or a wall plug. You can also use it while plugged in.
1894019
I was also under the impression there was a battery. NO, it will not work without being plugged in. The description of the product is poorly written. I means that you can plug in and charge the internal battery of the device (MP3 player, cell phone Ipod, etc.) you are using
1569732
It must be plugged in. But it does have a battery because there is a CAUTION: Risk of explosion if battery is replaced by an incorrect type.
786405
Electric. Plug it in. I don't think batteries would ever give enough power.
2141308
It looks to be an internal battery. You will receive a cord that plugs into the unit and into a 110 outlet to charge the unit. I can't see a way to open it up and replace the internal battery.
2175576
I think it has an internal rechargeable battery, charging through a USB to mini USB.