Logitech's X100 is a "micro" wireless speaker that competes with such models as the JBL Clip and Divoom Voombox Travel. They're all similarly shaped (think hockey puck or doughnut), cost about $50 (you can find them for £40 in the UK or AU$60 in Australia), and produce bigger sound than their tiny size would indicate.
I like the hard, rubberized finish on this speaker and it seems fairly durable. It's got a little loop on the top that allows you to hang the speaker from a backpack or doorknob or whatever and you can also just lay it flat and have the single driver fire upward. It weighs a scant 5.6 ounces (159g).
Battery life is rated at 5 hours, which seems to be about average for this type of speaker, and it has speakerphone capabilities and an auxiliary input for non-Bluetooth devices. It charges via Micro-USB.
I can't tell you that this model sounds any better than its competitors, though it's arguably their equal. The Divoom Voombox Travel, for instance, plays louder but does distort at higher volumes. The JBL Clip is right there with the x100 in terms of sound (it distorts a little, too) and offers similar battery life and a "clip" for hanging the speaker on a backpack and elsewhere.