Can you recharge it using 220V power outlet when traveling to Asia or Europe?

THE FOLKS WHO ANSWERED YOU ARE WRONG. Read the charger's 'wall wart.' Like most modern chargers, it has a built in converter and it takes input from 100V to 240V. The only 'adapter' you need is a plug that takes the U.S. two prong at one end and has the appropriate male elements on the other end so you can plug it into a Euro or Asian outlet. I go to Europe once or twice a year for extended stays and have done so for many years. I used to cart one of those heavy transfomer/converters around with me. I no longer need to do so, and you don't either. People should do their homework before they give misleading asnwers to inquiries.

once the battery is dead, as it has limited charge cycles. What is the solution. Can the battery be replaced?

by the time your battery loses charge (assuming proper care) there will be another better unit by UE or another manufacturer. THAT SAID, you can buy a battery pack for $10-20. I bought a 12000mAh battery for $20 and that is WAY bigger than Boom's original battery. Hope this helps. some of the smaller battery pack like the 4000Amh is quite small. the 2000Amh is like a credit card size. This is a much better solution than to open up the unit and replace the batter.IF anyone has a dead battery UE Boom and want to sell it to me for $20 I'll take it.

do you need two or one speaker

I'm not sure what you mean by two speakers. You don't need a left or a right speaker. This speaker can stand alone and will play off of anything that has Bluetooth, or you can plug it in with a "headphone" like cable. I love it. I'm going to by another one to keep in another room.

How does the speaker stand when it's plugged in to the USB or 3.5mm cable? Does it go upside down or do you have to put it on the side?

The cable plug fits into the bottom of the speaker so the speaker is on its side. The front of the speaker has a sorta design w/ a plus and a minus sign which is made of rubber so that the speaker does not roll when on its side.Seems to me, d/t the plug being on the bottom helps keep it from dust. BTW, pushing the plus and minus signs together will tell you how much charge is left in the speaker.

Material	Plastic
Model Name	BOOM
Speaker Type	3D
Special Feature	Built In Microphone, Stereo Pairing
Recommended Uses For Product	Ears,Volume
Compatible Devices	Smartphone, Tablet, MP3 Player, Laptop
Surround Sound Channel Configuration	2.0
Color	Black
Included Components	wireless speaker
Product Dimensions	2.8"D x 7.1"W x 2.8"H
Item Weight	1.2 Pounds
Is Waterproof	TRUE
Warranty Type	Limited Warranty
Maximum Range	50 Feet
Number of Items	1
Control Method	App
Wireless Communication Technology	Bluetooth
Speaker Size	73 Millimeters
Power Source	Battery Powered
Woofer Diameter	4 Centimeters
Water Resistance Level	Waterproof
Customer Package Type	Standard Packaging
Number of Batteries	1 Lithium Metal batteries required.
Audio Driver Type	Dynamic Driver
Bluetooth Range	15.24 Meters
Audio Driver Size	73 Millimeters
Subwoofer Connectivity Technology	Wireless
Number of Power Levels	1
Specific Uses For Product	personal
UPC	742010577423 097855092724 719040112405 603275251728 714497982434 712641707926 097855115751 738516429878
Manufacturer	Logitech
Shape	rectangular prism
Average Battery Life (in hours)	15 Hours
Item model number	980-000678
Hardware Platform	wireless speakers
Item Weight	1.2 pounds
Item Dimensions LxWxH	2.8 x 2.8 x 7.1 inches
Batteries	1 Lithium Metal batteries required.
ASIN	B00CM0XHNS
Is Discontinued By Manufacturer	No
Date First Available	May 21, 2013

Ultimate EarsBoom Wireless Bluetooth Speaker - Black

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