Rumen Petrov Youhaven't specified what exactly isn't working. But if the batteries are placed correctly according to the polarity, the pump works, and yet there is no suction, you need to do the following trick: put liquid in the container and try to trigger the sensor several times. Then you unscrew the top and while activating the sensor with your hand, simultaneously blow into the tube until liquid or bubbles appear through the nozzle. Then you screw the top and try to activate the sensor again. I found out from experience that after a long period of non-use, you have to touch the sensor from the bottom part (not the front one) with your finger to activate the pump. After that, the hand should be approached so that it is slightly bent in an L-shape, so that it acts on both sensors - front and bottom - at the same time. I've been using the device for five years now without any problems and so far I've only changed the batteries ONCE! That's right: about 2 and a half years with one set lasted! :-)

Rumen Petrov Yes, it is in the pictures in my review. You just have to fit the batteries carefully in the slot, because they hardly make contact with the plates due to their small size.

Rumen Petrov You can't! It is either a faulty sensor, or there is a short circuit somewhere from a wetness, or rust. Either way, you will need repairing services.

Rumen Petrov From the hygienic point of view it's not the quantity of the soap that is important, but the time the foam stays on your skin! Unlike the using of a regular soap bar, you have to wet your hands, before applying this soap foam, and then rub the foam thoroughly on your hands and leave it there for at least 20 to 30 seconds! The same rule applies using the regular soap bar.

Rumen Petrov I would strongly recommend that you do not use the USB port of a laptop, or a computer, for charging the batteries, even if it's USB 3.0! The USB 3.0 will be compatible, but it provides only around 1000mA power, and if you use more than one battery for charging simultaneously you will drain too much power from it, and you can burn it! I guess for one battery it could be used, but I still would not recommend - just use the wall charger which is powerful enough - more than 2.5 -3A! if you still have to use the USB on your laptop, make sure you put the battery in one of the slower slots - with 500mA charging.

Rumen Petrov Not exactly. It does not have a refresh function. But you can measure it by yourself when you deplete the battery completely, and then charge it to full. When you do this two- three times, you will see the approximately real capacity, as it will be shown, after the charge reaches the end.

Rumen Petrov It's with EU plug directly, you can see it on the second foto of my review.

Rumen Petrov Yes, build-in 1650mAh 18650 Li-Ion battery(measured, not the advertised and printed on the battery 2000mAh!). Charging current is low - 670mA, althow they printed on the fan 1000mA.