Well if you're looking for a Bluetooth speaker for the beach, balcony or anywhere else, forget about anything else and buy it immediately! The money it costs for what it offers is simply like they're giving it to you, powerful sound and nice bass, sturdy construction that makes you feel like it won't get damaged even if it falls from a high place, direct connection with your mobile phone, can play songs from a USB disk, supports micro SD, has an audio jack, and even has an FM radio that sounds incredible!
Regarding the radio, I have to say because some people write that it doesn't work, you need to have the charging cable connected, which acts as an antenna. In fact, I even used my own cable that had a gold-plated micro USB and the signal it picks up is crystal clear, like listening to mp3.
It can also be used as a Bluetooth headset for calls, you can answer and end calls from the speaker, and you can also use it as a power bank to charge your mobile phone or anything else you want!
Perhaps the best purchase I've made for 29 euros.
Note that it's not very lightweight, it's definitely close to a kilo in weight, but it's reasonable when it's something of quality, it has weight.
I would also like to add that I just noticed that when I connect it to my mobile phone, it shows me how much battery the speaker still has on my status bar. I don't know if it shows this on all mobile phones, mine is Huawei.