Do these need batteries to work? Or do they need batteries just to use the active noise cancelling?
1718877
Model "M4U 1" does not have noise cancellation. Model "M4U 2" has noise cancellation. From PSB website: "The M4U 2 model features three convenient modes of operation: Active Noise Cancellation (ANC), Active Mode, and Passive Mode (without batteries). Listen all day and all night with 55 hours of run time in ANC or Active modes. When you're out of batteries, switch to Passive Mode without missing a beat."
1718878
The PSB M4U1 does not have active noise cancelling. The M4U2 does have active noise cancelling
436114
These are great headphones. Although they are better for music since they have noise canceling. If you are willing to spend the money, then I recommend them. However, keep in mind that they need a AAA battery all the time. They won't work without it.
2284629
Neither! These are passive headphones (They do not have an internal amp). They simply reproduce the sound signal sent from the sound circuitry of the metal detector they are attached to. Nothing is amplified, so no batteries are needed.
646251
I use these headphones for the exact same reason. They don't completely cancel out the noise but they reduce it enough that the noise isn't bothersome any more. Keep in mind that these are not technically noise-canceling headphones, but they are instead noise-reducing headphones which do a great job. These headphones are, in fact, better than the -canceling ones for this kind of situation.
611578
None. They work perfectly. The only delay is when you first turn them on. They take a couple of seconds to synch with the base. Typically, I turn off the headphones whenever I'm done using them to save batteries.
722086
As others said, Active Noise Cancelling headsets work best to cancel out constant, low frequency noise (such as airplane humming). Office chattering is not something these headsets are designed for. Ear plugs work better in this scenario.
1943748
One is battery powered and has an internal active noise canceling amp the other is not active noise canceling and has no batteries.
2220501
Are not electronic suppressor style and do not use batteries. They encase your ear and just muffle the sound.
264699
Yes You Can Listen Without Noise Canceling. No, The Headphones Will Not Quit Once The Battery Goes Dead. The Battery Is What Powers The Noise Canceling Feature.
1439106
Someone sitting right next to you will be able to hear it a little bit if you have it cranked way up, but overall they contain sound well. The batteries last a long time. I got about 30 or more hours out of mine and use with noise canceling on most of time.
163562
The headphones will work to play music if the batteries are dead or removed, you just lose the active noise cancelling capability.
1880882
Yes, they will work without power and the battery fully drained. Just use the included audio cable/cord and plug into your device and you can still listen. Of course the noise canceling and audio processing will no longer work but you can still listen if you forget to charge the headphones or run out of juice on a flight/trip.
335599
Yes, they will function as ordinary headphones if the battery dies or, for that matter, if you turn the noise canceling function off.
1492495
Thanks for your question. These amazing sounding headphones have no active electronics and require no batteries. World Wide Stereo is 35 years old and and a very proud NAD dealer.
500740
They come new with rechargeable batteries, but after a year or longer and you want to replace them they can be replaced with energizer AAA rechargeble batteries. They require 1 on each side of the headphones for a total of 2. All the major brands have recharge AAA batteries, so just pick the brand you like.
1980467
The speakers do need batteries (AA's), but the unit doesn't eat batteries if you remember to turn it off.
988115
Mine do a great job. Obviously they aren't actual noise canceling headphones, but they doa great job in my opinion. Mine also fit snug in my ear which no doubt helps.