Electric Toothbrush

There used to be a series of sayings.. "You know you're getting old
when....." followed by something like ".....you bend down to tie your laces
and wonder what else you can usefully do while you're down there"
Today I realized how quickly one can get left behind by the pace of
modern technology - blink and you've missed it! Earlier, I casually picked
up an electric toothbrush belonging to a friend. It was seated onto a
small plastic pedestal which was wired into the mains, and obviously
contained a charger. The connection between the brush body and the charger
was by means of a solid plastic spigot on the charger being entered into a
socket in the base of the plastic body, there was no metal to metal
connection of any sort.
I assume the body contains a rechargeable battery. How is the
current passed into the brush body to recharge the battery - by induction?
Do any other products work this way? How much current can be transmitted?
How long has this technology been available?
Sigh......I have absolutely no idea how this thing works, what
else have I missed? Will the horseless carriage catch on? Answers on a
postcard, please...... :}