This is a Garmin High-Speed Multi-Charger (Model: 010-10723-17).
This accessory is designed to expand your vehicle's 12V power outlet, providing two high-speed USB ports without occupying the original outlet needed for your Garmin device.
Dual USB Ports: Use both ports to charge smartphones, tablets, or other USB-powered electronics simultaneously.
Simultaneous Charging: Allows you to power your Garmin GPS unit while also charging two additional mobile devices.
Compatibility: Works with a wide range of Garmin handhelds and navigators that use a 12V power connection.