why is the battery required
1269609
Battery is required to provide power for the noise reduction circuitry within the headphones! you can tell the difference by turning the headphones on and off! They work well!
1269610
Noise cancellation means that the device has a microphone which listens to the sounds in the room (ambient) and then transmits opposing sound waves through the headphones while playing music etc. This requires power to facilitate this technology.
1269611
It is required for the noise-cancelling function. They will work as regular headphones without it, but you cannot switch on the noise-cancelling capability.
1703289
No need to charge the battery first if you have it plugged in. There is a form without the battery, in fact.
87795
It does not need a battery in addition to the battery you're testing with. It does need a battery for testing.
1243229
I'm not sure I understand your question. It is an electronic device so it needs a power source. The battery is built-in, and can be recharged through a USB port on a computer or laptop.
1420880
This item doesn't have an internal battery. It has to be plugged in during operation.
2212342
It doesn't need a battery. I think what caused confusion is the need of cordless phones to have a battery to charge to be able to receive a signal. This is an "old fashioned" phone that is directly connected to the phone line. If the electricity goes out, it is not affected.
1897484
You can buy a power supply to eliminate the need for batteries. Check the instructions or go to google for more information.
1273762
The battery could be low so you may have to charge it. Also the contact between the battery and contact point is in need of cleaning so if you have some contact cleaner or alcohol spray bottle that should do the trick.
1091547
LOL. It requires no battery. It's a beautiful, cylindrical piece of rosin. Highly polished.
373246
I believe it is the design to merely run off a battery pack. Since it is an emergency radio, the design asumes that electricity is not available for the average radio or television thus engaging this item to usage.
1683537
The battery provides backup power, but my guess is the loud sound cannot be driven for a long time by a simple battery and thus requires external power.
1298672
4 - AA batteries are required, although I just use it plugged in. Works great!
1985511
The battery is there for backup in case of a power failure. We selected this model specifically because it will not need frequent battery replacement.
2090153
There is no battery needed. Alternatively, if you wanted to use a battery pack you probably can, but again, not needed. It comes with a Mini USB Male to Common (A-Type) USB Male Cable. Ive powered this from a laptop and had no issues. I also plugged it into an extra USB Adapter from an old phone and worked great.
1434651
It came ready to use. It did not require batteries. Whether there is an existing battery that may run out at some point, that I am not sure about. All I know is that it did not require batteries right out of the box. It has provided hours of music and if pun for our granddaughter.
879016
I guess I missed it. The two batteries are obviously included in the base of the devices. Maybe I'll grow up but then again, why. Thanks for the info.
521802
The battery is built in. Plug the cord in to charge. Once charged can use without the cord. You can also use while its charging with the cord plugged in