PK ring is easy to use though，but there have been several problems:
1. Easy to cause collision sound
Be careful not to make too much noise with the ring when you attract the object 2. Not being invisible enough, some viewers will suspect something is wrong with your ring and ask to take it off. This makes it difficult to achieve the original effect
3. Easy to break, some quality is not good enough PKring is easy to fall to the ground and break.

The Silent secret device Silent Assistant is improved for these points
To retain the function of the original ring,and turn it into an invisible, noise-reducing weapon.
In the promo video you can see the official show you the structure of the props directly.
Can be cleverly hidden in the location of the finger.
The fake skin on the top also provides sound muffling.

The props are cleverly hidden in the belly of the finger, and the fake skin on the top provides sound cancellation, which is very clever
Challenge replaces magnetic ring, more invisible, more silent
Wider extensibility, able to complete all magnetic ring effects
5 processes, 9 programs