Finally, there is a Zigbee interface USB switch produced by a popular manufacturer.
At the moment, it is available from the Sonoff web site only :
As usual for the most of the Sonoff products, it is expected that the basic On/Off functionality will work out of the box using Hubitat stock drivers ( the Generic Zigbee Switch).
hmm… i might need to find a battery that can power a C-7 / C-8 for exactly 5 mins so i can take 1 more automation away from Home Assistant. 
Uhhh... If you mean to forcebly power off/on a Hubitat hub if anything else fails, it is better to use another technology, not depending on Hubitat hubs itself...
The only WiFi power plug I left in my inventory is used exactly for this purpose - independent control of the HE hubs power supply via Alexa. And I have not used it for quite a long!
BTW, there is already a similar device, but much more expensive and rather difficult to source :
Ordered two. Thanks!
I already use hubitat to tell home assistant to do a gracefull shutdown and cycle power of my C7 via the wifi version of the same adapter when certain conditions are met. i fully appreciate your concern and i understand finding a battery that can consistently deliver 5mins of power consistently, over time is a very tall order due to physics. Getting this wrong will cause problems, but i can dream. 
Of course right after I purchase five or six of the Wi-Fi versions.
【Wide Transmit Coverage】 Elevate your network capabilities with Turbo Mode, featuring advanced technology that boosts signal range and strength, and provides a seamless and stable connection for your devices.
Hopefully it's repeater is more like the dongles (which work good for me) than the plugs/relays (pretty crap IMHO).
It's a repeater? Hmmmmm.
Neat. Thanks for the heads up.
I just ordered three of them to get the 10% off
Yep.
I don't have the setup any more, (didn't see the real need, in my case), but I used to have a spare hub power cycle the main hub after it shut itself down.
I used a ZEN16 with some 'fabbed' cable, as I recall, lol. This would've been a lot cleaner.
How can I tell if it's a repeater once I get it?
Use the community Zigbee Map app to see if any battery-powered Zigbee devices uses it as a router.
As the Sonoff ZBMicro uses the same chip as HE C-8, most probably the ‘turbo mode’ is boosting the Zigbee radio power to level 12, as in Hubitat.
Thanks. It's been so long I visited the map I forgot about it!
Would it be derailing the thread to ask folk to leave some of their Use Case ideas as they comment on this. I'm struggling to think of what all I have that runs on USB that I'd really need to control (or that would be safe to control) with this.
Don't get me wrong, I want this...even if "just because" 
and click the link to see the picture of my existing setup...
I plan to use the USB switch to control the charging of a tablet that I will use for a HE Dashboard.
I will turn the charger for 30 minutes a day, or something similar.
Currently, I do not have any tablets used as a dashboard in HE after my old ASUS Windows tablet broke one year ago (I am lucky it did not explode!) because of a battery overcharge. It was on USB power supply 24/7.
Be interesting to see how long it lasts plugged into a battery bank.
Might be a good "portable hotspot" for outdoor ZigBee coverage.
Well, indeed it would....
because I'm thinking about a remoted USB powered device which I need ON at night but OFF by day (to allow solar panel recharge of the battery).
Hmmm.. it does data too.
What could that be used for?
