Added 2 pairs of batteries from smartphones. Got about 6000mAh. If someone does, then we connect a couple of batteries in series, because. there 7.4V Pros: Really pleasant sound, with a long listening ears do not "get tired". There is light music. Convenient carrying strap. I consider the relatively directional sound to be more of a plus than a minus, because. if we take speakers of identical power, then the directional one will have a higher volume and it can be directed at the listeners. Some cons: 1) indoors, the radio does not catch at all! on the balcony when connecting aux catches with interference. There is a Ginzu column, which catches perfectly. You bring it to Sven and it also starts to emit a lot of light. Conclusion: the chip itself in Sven interferes with radio waves. On the street with aux, it only catches 6-7 stations well. By the way, there is no difference for the antenna - connect aux or usb. 2) the control panel is located on the top and is very prone to dust settling, etc., it would not be so critical from the front. 3) light music has only 2 modes and cannot blink to the beat of the music. 4) very weak battery. Need to add.