Feature: 1. Purpose: This voltage indicator is used for 1-8S lithium battery inspection, self checking each battery voltage and large voltage of lithium battery, and supporting reverse connection protection. 2. Overcharge Prevention: Allows you to know the working state of your battery at any time and anywhere, so that the battery will not be damaged due to overdischarge or overcharge. 3. Real Time Viewing: Plug the electric display into the battery balance charging connector to know the battery power status whether in flight or idle. 4. Display Mode: This battery monitor can display battery voltage, total voltage, minimum battery voltage and remaining battery capacity. 5. Safety Alarm: When the voltage is lower than the default value, the alarm will ring and the LED light will flash, the factory default value is 3.3V, you can readjust the voltage value and save the setting value. Specification: Item Type: Lipo Battery Voltage Tester Monitor Material: Plastic, Electronic Component Gross Weight: 44g / 1.6oz Type: RC Accessories Product Size: Approx.40 x 25 x 12mm / 1.6 x 1.0 x 0.5in Suitable: for Llpo 1-8s for Li lon for LiMn for Li Fe RC drone battery. Package List: 4 x Battery Indicator Note: 1. Please allow 1‑3mm error due to manual measurement, thank you!2. Due to different shooting lights and different monitors, the pictures may not reflect the actual color of the real object.