The back of the speaker is relatively mundane, with easily accessible connections for aux input and a power adapter (included). An integrated kickstand hinges out from the lower half, which also conceals a battery compartment for four AA batteries.
Altogether, the SBD7500 is a lightweight (9.6 ounces) and compact speaker measuring 4.3 inches tall by 12.2 inches wide by 1.6 inches thick. Fitting the speaker into a backpack or carry-on bag shouldn't prove a problem, but Philips provides a fitted neoprene bag just in case you want to take it solo.
Featurewise, the Philips team kept things simple with the SBD7500--maybe too simple. Compared with similar speakers from Altec Lansing and Logitech, the SBD7500 doesn't offer extras such as FM radio, remote control, or Bluetooth compatibility. Aside from a switch that engages a subtle bass boost feature, the SBD7500 is a really just a straightforward, plug-and-play iPod speaker. Compatibility with the iPhone, as well as shielding against mobile phone interference, are a nice bonus.
The SBD7500 isn't meant to be an audio centerpiece. Ultimately this is the kind of compact, utility-minded speaker you pick up for an office, kitchen, garage, or spare bedroom. Fortunately, with the option to power the SBD7500 from four AA batteries, it's easy to take this speaker from room to room to suit your needs. One set of alkaline batteries should provide about 8 hours of playback at a reasonable volume.