This document specifies the terms and definitions, basic requirements, general requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage and quality commitments of outdoor decorative LED light strings (hereinafter referred to as LED light strings). This document applies to Type A decorative LED light strings specified in GB/T 39943-2021 for outdoor use with a power supply voltage not exceeding 250 V, using LED light sources, connected in series or parallel, and in series and parallel.