SRS -XB21 speaker is a good portable Bluetooth speaker which has a good Bluetooth range, much better-improved sound compared to Sony’s XB-40 speaker. Major point compared to XB-40, it is IP67 certified, so you have nothing to worry about the device from water submerged up to one meter or dust issue or washing the device. It is a sturdy product and passed 4 feet drop test. As per my preference listening at 50% volume, the speaker’s Highs, Mids and Bass pretty good compared to XB-40. The Bass improvement is much better and you can change the sound preference via the Sony Music Center App. I am not a great fan of lighted speakers but sure some consumer will like it, it has some preset mode of sound and control via the App. Also, the new feature about making music with hitting 5 different places on the speaker, didn’t appeal to me but maybe children will love it.
So overall good buy for consumers who are looking to sturdy, beautiful, premium looking, IP67 Certified portable Bluetooth speaker.