Now you won't ever wonder how much salt or pepper are left in your shakers with these D-cell battery-shaped salt and pepper shakers. These shakers can be easily 're-charged' by opening the lid and pouring more salt and pepper in. There are also see-thru 'power indicators' on the side so you can see what level your salt and pepper content is at. Just don't get them mixed up with real batteries, because these won't help to turn your flashlight on. (Thx Random-good-stuff)