Hamilton Devices would like to proudly introduce the FIRST EVER Butterfly Knife-Like design battery! The Butterfly offers smooth and reliable flipping action that will keep you entertained for hours. It also comes in various colors that will add a sense of luxury when you carry this device to any occasion. No matter if you’re a righty or a lefty, this battery will perform beautifully for you and your friends. You can’t go wrong by adding this one-of-a-kind cartridge battery to your collection.