It’s strongly advised not to wash a bike with karcher, and it’s even forbidden by some builders who cancel the warranty.
The HOOT Bike Tracker isn’t resistant to karcher, at best for a few seconds. It’s resistant to washing and rain.
If your bike is wet, don’t recharge immediately, let it dry by wiping away accessible surfaces as much as possible.
Be careful not to use a high-pressure wash on your bike because a problem with it’s not part of the HOOT warranty.