Name: iMainGo X
What it is: A portable speaker for iPod, iPhone, iPod Touch and most MP3s, even electric guitars in need of a practice amp. All you need is a 3.5-millimeter connection.
How it works: Plug your device into the input port and use the volume control on your device to change the sound level. Your phone, iPad or MP3 can be placed inside the clear, vinyl cover t o operate controls or watch video.
The good: This is a new generation after the iMainGo 2, which I already loved. A big difference in this is a rechargeable lithium battery, which eliminates some hassle. The sound is huge for such a small device. My cousins (dancers) visiting from Norway insisted on ordering a couple before they left for home. They planned to "daisy-chain" them, a feature of the newer model that lets you plug one into the other to multiply the sound. Just two can make a pretty good party. The maker, Portable Sound Laboratories, claims this has bigger, better sound than the earlier box. That may be, but the older one was hard to top.
The bad: There is no gauge to tell you where you stand with the charge. A strategy is to keep it plugged in if you're near an outlet; then you know you'll be ready for the road when the time comes. Cost: $70 (If that's too steep, get the earlier version at $40) Available from: portablesoundlabs.com, amazon.com or Target