dimonhldv , Thank you for your interest in my questions :)
Surveys of all sorts come across, especially on "Muska". But as our forum bans any reference to it, it is impossible to give a link to it.
But I think you can easily find this review by its name -
Perhaps the best USB-tester WEB-U2. Large color screen, charging protocols trigger an external power supply.In it, first, browser have storage time is 7 days, and secondly, in the same place in the table shows the Chinese option 2 for 100 hours, which is about 4 days, apparently, it is about the same.
What to Bluetooth, then probably yes - seeing on the tester Bluetooth icon, I have decided that it is present. It turns out, the Chinese are once again deceived o.O
And I need to have Bluetooth, because the solar batteries, the energy of which needs to be monitored, are on the balcony, and the computer, or is there an Android, is in the room, and a long USB cable will be very inconvenient to carry to them.
What you actually bother?
Confused by the difference is 1000 times - may be one of the drafters of the documentation was wrong?
Since UM25C, even if he is poorer in functionality, Bluetooth but it sure is, and I would take it.
But here's an ambush - the ultimate power in it all up to 99 Ah and 99 Wh, that for the control of solar cells is very small.