Key benefits Direct Current input and output at 16V supports practical DC power use with this battery box. USB output provides 5V at up to 2A to charge mobile phones and other USB devices. Easy to operate by using 4 pieces of 18650 or 26650 batteries, enabling straightforward replacement and setup. Waterproof design protects the unit in wet or damp environments. 3 LED power indicators give a clear read on remaining capacity for reliable planning. Key attributes Battery configuration: uses 4 pcs 18650 or 26650 batteries DC rating: Direct Current input/output voltage 16V USB output: 5V, up to 2A Waterproof function: yes Power display: 3 LED display lights Specifications and usage Input/output voltage: 16V Direct Current USB charging: 5V at up to 2A Battery compatibility: 4 x 18650 or 26650 cells Durability: waterproof function Power status: 3 LED indicators Use scenarios Outdoor camping or hiking: keep smartphones and small USB devices charged while in remote or exposed environments; cells are easily replaceable. Emergency backup: provide portable DC/USB power during power outages or in areas without reliable mains supply, with protection against moisture. Remote work or travel: use onsite or in transit to supply power to compatible devices and charge USB equipment, especially where weather or exposure is a factor.