KV-4/2 tactical switch was designed for simultaneous control of  LED flashlight 'Klesch 2' and Aiming laser Perst-4.

If you have Perst-4 manufactured before January of 2020, customer needs KV-4/2 ,but if customers buying it for a new Perst, KV-4/2 will not be compatible. 

Perst-4 made after January of 2020 are compatible only with KV-4/2U

KV-4 / 2 or KV-4 / 2 U

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