At $70 (UK£54, AU$99), Sony's SRS-X11 is at the higher end of the micro wireless speaker market, which is rather crowded these days.
While you can certainly get better-sounding speakers for that price, you'll be hard-pressed to find a tiny wireless speaker that sounds as good as the SRS-X11. So, by good I mean good in the relative sense.
Weighing 7.6 ounces or 215 grams and measuring 2.4 inches (6.1 cm) by 2.4 inches (6.1 cm), the X11 is smaller than a Rubik's Cube and seems well built, with enough heft to it to make you think it's got some substance. Available in multiple color options, the speaker has a soft-to-touch finish on both the back and top of the speaker, where you'll find the power button, volume controls and an answer/end button for the built-in speakerphone, which works OK (in other words, don't expect this to perform like a business-grade speakerphone).
Additional features include and an audio input, NFC tap-to-pair technology for smartphones that support it, and the ability to join two speakers together wirelessly and create a left/right stereo pair or just double up the sound.