Based on this product's specifications, here are some alternatives and similar models
Pressure switch Nitecore RSW2i for Nitecore P20i and P10i flashlights
Summary description:
Nitecore RSW2i is a pressure switch designed for use with compatible Nitecore flashlights, specifically the P20i and P10i models. It provides remote pressure-activated on/off control, enabling convenient momentary or constant operation when mounted on a weapon or hand-held setup. Ideal for tactical, hunting, or hands-free lighting needs where quick activation is required.