Using the Spotty Brand Portable LED Flashlight Dog Waste Bag Dispenser is a piece of cake. First, clip the dispenser onto your dog's leash using the metal carabineer. When it's time to pick up your dog's waste, turn on the LED flashlight to clearly see the mess. Grab a bag from the dispenser, do the cleanup, and tie the bag up. As for the batteries, they're already included, but when they run out, just replace them with new ones of the same type. To keep your dispenser in good shape, keep it dry and away from extreme temperatures. Also, check the bag rolls regularly to make sure there are enough bags for your next walk. If the dispenser gets dirty, you can use a damp cloth to wipe it clean.