Altec Lansing Technologies yesterday previewed its latest inMotion iM portable audio speaker system for music players, including iPods.

The inMotion iM4 Portable Speaker System has a stand-up rubber platform measuring 10.25-inches-x-5.3-inches-x-1-inch (26.03cms-x-13.46cms-x-2.54 cms), with speakers on either side. When the system is in use, the middle of the platform can fold down to hold a portable audio player while the speakers remain standing. The iM4 can deliver 18 hours of audio playback on its four AA batteries. It weighs 1.75 pounds (0.79 kg) without the batteries.

The speaker system uses a 4-watt digital amplifier and has technology to produce deep bass without a subwoofer, the company said. A retractable cable connects the system to the portable audio player, and a second audio source, such as a PC, can be connected to the speaker system with an auxiliary input jack.

The portable speaker system will be available in different shades to match the colours of different music players, and ships in the US in February for $129.95. It ships with an AC adapter, an international plug set, a power supply and a carrying case, the company said.