This kind of necklace with ring is used especially for eMode. The necklace will enable eMode to be convenient to carry and use, letting you enjoy puffs at eMode at will.
Colors:Black, Silver, Blue, Red
Instructions:There are two projections inside the ring (see Picture 1)
and four dents on battery's top (see Pictures 2).
Assemble ring onto the battery's top with its projections in dents of
battery, ensuring ring has no ability to move (see Picture 3).