Here's an offer for two sets of ready-to-use bubblers. The hose lengths and stone types are different for each set. Each set includes: waterproof cover x 2, stone x 2, hose x 2, and main unit x 2. This is a set with 3 used batteries and 1 new battery. Shipping will be via Yu-Packet Post. The thickness exceeds the limit, so the lid will be opened for shipping as shown in the 6th photo. Please be aware of this. As a bonus, you'll receive a Kitty-chan "Buri" (Yellowtail) sticker, the ultimate good luck charm for yellowtail fishing! (See the last photo). It's not for sale, so it's said to be valuable. If I were buying a bubbler, I'd be happy to have new batteries so I wouldn't have to worry about running out of power. Imagine buying bait at the tackle shop and then having your bubbler break down on the way to your fishing spot! Your precious bait dies. Having multiple units on hand can prevent such troubles. The liveliness of your bait directly affects your catch. Suitable for "nomase" (live bait fishing), "ayu" (sweetfish) fishing, shrimp casting, squid fishing, and even ornamental fish.