Instruction: Answer the given question using the supporting document.

Input:
Question: What can you do with them.  I thought I was buying earbuds to listen to my I-pad with.  Also how do I charge it?
Document: I was SO excited to get these for my husband to cancel out our 3 children when he tried to sleep during the day and being that he loves to listen to music while he sleeps I thought this was perfect BOY WAS I WRONG! They have to be charge but die so quickly and the noise cancelling is a joke. Don't waste your money just save for better!
However, I was pleasantly surprised by the effectiveness of the DS-101A. The Audio-Technica ANC23 offers a tangible improvement in both quality and ergonomics but also costs twice as much. I'm happy with both earbuds I purchased but the price of the DS-101A is very hard to beat.
I have to come back and edit this. I put these earbuds through more practical use testing by using them at work while watching Youtube videos. They cut the background noise level in about half, really don't affect the bass of the audio input like I initially thought, and slightly amplify the audio input overall. When the ANR is activated you can still hear things in the background but it really isn't noticeable when audio is playing.
I purchased the Digital Silence DS-101A for my wife at the same time as a pair of Audio-Technica ANC23 for myself in preparation for a trans-Pacific roundtrip flight. I also wanted to compare the effectiveness of a $20 set of earbuds vs a pair that costs around twice as much.First, the DS-101A is fairly effective at blocking out the worst of the airplane engine roar.
But for a few dollars more I have to assume there is something better. By the way the earbuds are harder than the silicone ones I am used to. The microphone is also at a 30 degree angle. That creates a strange fit. And my ears never adjust to the sensation. So it is an annoying feeling in my ears the entire time I wear them. Always best to try earbuds for your ears before you buy.The noise canceling part does quiet some sounds slightly.
The instruction recommends to charge the device at least 2-hours before use. The LED indicator will be red during the charging process and become dim or completely turned off when done charging. The green LED which in some devices indicates fully charged battery is used instead to indicate that ANC (Active Noise Cancelling) is turned on.It comes with 2 extra pairs of silicone earbuds with the middle size already attached to the earphones.
Excellent low cost noise canceling headphones. USB charge lastsat least 10 hours, and seems to preserve most of the charge for at least a couple of months between uses.
bought them to take them in a 12 hr flight. no need to charge in the complete trip used them for over 25 hrs now and no need to charge yet. very good. very satisfied. very good noise cancelling.
This does not work for me because I thought it was noise cancelling, like the kind that cancels all noise in the room. This would work good for computers that have problems with AC 110V line noise hum. I think it would perfectly for that. It does not do anything for cancelling out a noisy room, like a bunch of people talking too loud or an air plane.
I use these with my iPod on the way to work. They really cut down the ambient noise on the bus and allow me to listen to  my iPod at a lower volume. Don't expect total elimination of ambient noise. They work better than expected.
Answer: Yes, it is for portable device listening.  You recharge in a USB port, using the connector that should have come with your phones.