Features: The Digital Voltage LED Display Indicator provides precise voltage readings for 2-6S lithium cell batteries, ensuring you always have accurate understanding of your battery's performances. Featuring intelligent microcontroller control, this voltage display automatically adjusts to different battery capacities without manual setting, maintaining precisions of within 0.03V per cell. Ideal for drones enthusiasts, model players, electric tool users, and professionals requiring battery management, this device is essential for anyone who relies on lithium batteries. Perfect for outdoor flying, model competitions, daily battery maintenance, and any scenario where battery monitoring is essential this indicator help prevent over discharge, the leading cause of battery failure. With its easy to use design and compatibility with 7.4V to 22.2V battery packs, this battery accessory ensures long time battery health and efficiency, making it a must for all your power needs. Specifications: Item: Digital Battery Voltage Indicator Checker Tester For 2-6S lithium batteries Accuracy Control within 0.03V Input Voltage 0-4.5V/each battery For 7.4V/11.10V/14.8V/18.5V/22.2V lithium battery pack Measurement up to 22.2V (6 series) battery cell voltages Size：about 4.8x1x2cm/1.89x0.39x0.79in Package Includes: 1PC Battery Voltage Checker note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.