EZNectar is the ONLY all-natural, ready-to-use disposable hummingbird feeder on the market. Patented because it is all-natural, and ready-to-use, containing no dyes, no preservatives, and no electrolytes. Sometimes preservatives are called electrolytes. Preservative and electrolyte additives are not part of a hummingbirds dietary needs. EZNectar uses only pure cane sugar and filtered water -- it is 100% pure. Your Hummingbirds will love it. This feeder is perfect for camping or taking on vacation or simply keeping it handy in your pantry, for when an unexpected hummer visitor comes to the back window. With EZNectar, there are never any dyes or preservatives or electrolytes. No mixing, no cleaning, no mess! Just take outside and hang!