Precise, reliable DC passthrough with emergency backup support Why you need this Keep network equipment and small electronics running during power interruptions by using a power bank as a backup source. Selectable voltage and a clear LED readout make it simple to match device requirements and avoid incorrect connections. Compatible with a range of lowvoltage devices, so one compact accessory covers multiple use cases. Key features Precise voltage control: intuitive switch selects 9V or 12V output so you can match the voltage your device needs. LED display: realtime voltage readout provides accurate information for safe and confident operation. Robust construction: designed with quality electronic components to support longterm operation and dependable use. Emergency backup capability: use with a power bank to keep routers and other devices powered when mains power is interrupted. Flexible compatibility: works with various 5 V devices such as fans, lamps, and power supply adapters for versatile applications. Performance and design Compact footprint for easy placement near routers, network equipment, or workstations. Stable, selectable outputs help reduce the risk of mismatched voltage and support consistent device operation. Durable electronics and a solid housing provide practical longevity for everyday and travel use. Typical use scenarios Home router backup: connect a power bank and this passthrough to keep your router powered during outages, helping maintain internet access for work or study. Portable lighting and cooling: power small 5 V fans or lamps from a power bank during outdoor gatherings, camping, or workshops. Field or travel use for network devices: provide selectable 9V or 12V output to support modems, adapters, or small networking equipment when mains power is unavailable. What it solves Eliminates the need to locate a mains outlet immediately during a power loss by enabling temporary operation from a power bank. Simplifies voltage selection and monitoring with a switch and LED display so users can quickly set the correct output. Reduces the number of separate power accessories you need by supporting multiple lowvoltage devices. Compatibility Designed to work with a variety of 5 V devices including fans, lamps, and power supply adapters, and to provide selectable 9V and 12V output for compatible equipment. This product provides a compact, practical solution for maintaining power to routers and small devices, offering selectable voltage, visible feedback via an LED display, and durable electronic construction for everyday and emergency use.