Optimized Battery Management: Easily monitor your battery's charge level with our LED display indicators, designed specifically for 18V and 21V lithium batteries. This tool is essential for efficient power management and prolonging battery life. Universal Compatibility: Our indicators are compatible with most 18650 lithium battery setups, making them a versatile addition to your toolkit. and Reliable: Crafted with quality materials, these indicators long-lasting performance and reliability in working conditions.<br><br>Colour:Black Material:ABS Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use<br><br>Package Contents: 5 set * Electric Drill Battery Indicator Display<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.