Features: This for battery display provides real time capacity monitoring for 18v-21v batteries, ensuring uninterrupted work by accurately indicating power levels to prevent unexpected depletion during tool use. Featuring high brightness LED indicators and a durability PCB plastic construction, it offering clear visibility in any lighting condition and resists environmental wear for reliabled performances. Ideal for both professional technicians and home users, this Battery Capacity indicating caters to anyone needing efficient battery management for power tools like drills and screwdrivers. Perfect for home projects, professional construction sites, or outdoor tasks, it allows quick checks in demanding environments to maintain workflow efficiency. With tool less installation, it integrates seamlessly into battery packs, enhancing productivity and reducing downtime for seamless operating in various applications. Specifications: Component： PCB+plastic Size: Suitable for 5S battery (18V/21V) Attribute: LED display Board Size：about 40x12.5mm Technical parameters: Supports 18650 battery, suitable for lithium batteries, accurate power indication Suitable for battery capacity display of electric drills, screwdrivers and other tools Package Includes: 1Set power display board note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution