Based on this product's specifications, here are some alternatives and similar models
Microshift left twist shifter MSH-DS85-LF, 3-speed compatible with Shimano, friction/indexing with gear indicator
Summary description:
Left-side Microshift twist shifter MSH-DS85-LF for 3-speed drivetrain compatible with Shimano systems. Operates as friction or indexed (3-rd) shifting and features an optical gear indicator. Designed for cable-actuated setups, it provides manual thumb/twist control for front or rear shifting on compatible bikes, suitable for commuting and touring.