There are two shortcomings of the Sony SRS-XB12. First, it can not be held on or stay asleep without connection to any device. It will automatically shut down. So you need to turn it on every time when u use it. If you have two of them and make them as a pair, then you need to turn on each of them. The most dissatisfying stuff is that if you have two of them as a pair and you want to connect them with another device, then you will have trouble. You need to operate many times, press the “power button” and the “add button” to successfully connect them to another device. All in a word, it is not recommended to buy this model.