The kit requires the battery spring from the original G2 tail cap.
The kit also requires a way to mount the tape switch to the forearm, such as double-sided tape, which is not included.
These are not deal killers, but i wish I was informed in the product discription before purchase.
One reviewer found that the switch required a lot of pressure to activate. I did not find this so.
Pros: An inexpensive solution.
Cons: All required parts not included.
This review was written in the old system and had content requirements that are different than reviews written today.