Feature: 1. TECHNICAL PARAMETERS: The operating voltage of the battery meter is DC8‑30V, and the measuring voltage is DC8‑30V, support the voltage and remaining power measurement of lithium batteries, acid batteries, and lithium iron batteries 2. DUAL USB PORTS: The battery monitor has USB and Type C ports to measure the battery voltage and remaining charge while charging other devices, useful and practical 3. REVERSE POLARITY PROTECTION AND LOW VOLTAGE FLASHING ALARM: The battery monitor provide reverse polarity protection. When the measured voltage is low, the screen flash to alert user 4. POWER OFF MEMORY: Battery monitor with power off memory function. Once the proper mode is set, the settings are retained even after a power outage. No reconfiguration is required for subsequent use, easy to operate 5. VERSATILE APPLICATIONS: Battery meter is suitable for installation in carts, cars, motorhomes, motorcycles, boats, electronic repairs, DIY electronics projects and a variety of other Settings to measure battery voltage and remaining capacity Specification: Item Type: Battery Meter Model: 4829 Material: PC Supply Voltage: DC 8-30V Measuring Range: DC 8-30V Applicable Battery: Ternary lithium battery, acid battery, lithium iron battery USB Output Voltage: DC 5V. Package List: 1 x Battery Meter1 x Connection Cable Note: Please allow tiny size error due to manual measurement. Thanks for your understanding.