Divoom's Voombox Travel is a mini ruggedized wireless Bluetooth speaker that, as its name implies, is designed to be easily transportable. Along with being shock resistant it's also splash-proof and relatively inexpensive at $49.99.
The first thing you'll notice about Voombox Travel is that it's heavier than it looks and feels quite solid (it weighs 9.6 ounces). The speaker is available in a few different trim colors and it comes with a carabiner attached to a pin at the top, which gives it a bit of a grenade-like appearance.
Its rechargeable battery is rated to deliver 6 hours of music listening at moderate volume levels, which is fairly typical for these types of speakers. Beyond the water-resistant design, the other extras include built-in speakerphone capabilities along with Bluetooth 4.0, which makes it easy to pair with any Bluetooth-enabled device, including smartphone, tablets and laptops (the wireless range is the standard 33 feet).
An included Micro-USB charging cable doubles as an audio input cable for non Bluetooth devices, plugging into the USB port that's hidden behind a removable rubber gasket. No AC adapter is included, but you can charge via your PC or any smartphone or tablet USB power adapter.
The speaker has two drivers facing opposite directions, which makes the speaker's placement a key component of sound quality. Really, the bottom driver needs to be facing some sort of surface at pretty close range or else you lose a lot of bass.
I put the speaker on a variety of flat surfaces and it sounds pretty good in that position and plays loud for its size. The only problem is that when you crank up the volume -- there are volume controls on the speaker, though no transport controls or pause/play button -- the speaker vibrates and can end up moving around a bit. It also distorts. Badly at times.