What this product does Suited for outdoor power supplies, portable power banks, instruments and other equipment, it provides a battery voltage display and an additional USB port to charge mobile phones and other 5V devices. Core functionality Fully functional unit that displays battery voltage and remaining battery power, and can charge 5V devices directly via USB. Key benefits Realtime monitoring: keeps you aware of battery voltage and remaining capacity at a glance. Convenient charging: USB output allows charging of mobile phones and other 5V devices without separate adapters. Versatile compatibility: designed to work with outdoor power supplies, portable power banks, instruments and related equipment. Simple operation: plug in and use to monitor power status and charge devices as needed. Compatibility and power Compatible with outdoor power supplies, portable power stations, instruments and other equipment that use or require battery monitoring and USB charging. USB charging supports 5V devices such as mobile phones and similar USBpowered devices. Use scenarios Outdoor or field work: monitor battery voltage and remaining power while using tools or equipment, and keep your phone charged via USB. Onsite maintenance or testing: easily view battery status for connected devices and charge accessories through the USB port. Emergency or travel: use the USB output to charge your mobile device during power outages or while on the go. Notes Size and material are not specified in the original description.