Garmin 010-12769-00 Active Speaker ADDDEIC3 Also charges Li-ion (LiFePO4) batteries:

Also charges Li-ion (LiFePO4) batteries: Charger on-off control can be implemented by connecting a relay or open collector optocoupler output from a Li-ion BMS to the remote on-off port

which can be utilized as the RotoKey on NavNet TZtouch and for zooming in/out on

HD Wheel Chock with Mounting Bracket

as well as an optional device tether that is recommended for outdoor applications

and backed by the world's only satellite network that commands real global coverage

Garmin 010-12769-00 Active Speaker ADDDEIC3 Also charges Li-ion (LiFePO4) batteries:Specifications Manufacturer Part Number: 010 12769 00 Active Speaker Connect your compatible VHF radio to a handset for on board communication. The active speaker has a knob to adjust volume up or down as needed on the compatible handset. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov.