Tall boots that are stiff bug me to no end. Only used one so far. Não é confortável. It did the job we needed it to do. Super disappointing! There was supposed to be 1000, i only got 670, and a good portion of them didnt have usable holes, just open gouges in the side of the stones. -Tom I also read a review complaining that depth of field is too shallow close up. 4) Press the button on each unit again for 8 seconds. I did not use the usb plug as my camper came with multiple Ian outlets.