This chapter provides an in-depth examination of sprinklers, focusing on their overview, design fundamentals, major components, technical specifications, and selection criteria. Firstly, it outlines the features, types, and uses of sprinklers, along with insights into future development trends. Secondly, the chapter details the core principles of sprinkler design, including parameter determination, chassis selection, powertrain and transmission system design, load distribution, stability checks, and power calculations. Thirdly, it discusses the major components and parameters, covering the general layout and the water and control systems. Fourthly, technical specifications and performance testing methods are introduced to ensure reliable operation. Finally, guidelines for selecting appropriate sprinklers are presented, supported by inspection checklists and main technical parameters.