1. Push down the handle to open it.
2. Wear the necklace from eCab tank cartridge. Move it to the center between button and ornament.
(Attention: Please donot block the stoma under the ornament and donot press the button.)
3. Push up the handle and lock the necklace.
4. To remove the necklace, push down the handle again to open it, then pull it out from eCab tank cartridge.