LED Digital Voltmeter and Dual USB Charger LED Digital Voltmeter Measures DC voltage from 8V to 30V, suitable for both leadacid and lithiumion batteries. Provides realtime voltage readings to help you monitor battery health and avoid unexpected failures. Double USB Charger Two USB ports, each delivering 5V 2A. Can charge two devices simultaneously with a total output of 20W. Keeps your gadgets powered up when you are on the go or away from a wall outlet. Power Outage Memory Builtin memory preserves your settings after power loss. Enables seamless operation without needing to reconfigure when power is restored. Installation and Alarm Reverse polarity protection for safer installation. Low voltage alert: the display flashes when voltage drops, helping you take action before a failure. Wiring length is 30 cm for flexible mounting and easy integration into most setups. Key benefits Realtime voltage monitoring helps prevent battery damage and unexpected outages. Convenient dual charging capability supports multiple devices from a single source. Memory feature reduces downtime and setup effort after power interruptions. Safe and reliable operation with reverse polarity protection and a clear lowvoltage alert. Compatible uses and scenarios Vehicle battery monitoring: install in cars, motorcycles, or boats to keep an eye on the battery while driving or docked, reducing the risk of breakdowns. Offgrid and solar setups: monitor the battery bank voltage in campers, RVs, or solar storage systems while charging devices or appliances. Emergency power and portable kits: use with backup power supplies to charge two devices at once and receive a quick voltage status check during outages.