Just putting together (batteries, etc) of a Shuang Ma 7004 boat. Inside the hull of the boat, (seen with with the cabin top removed), there's a sticker/label with an unclear graphic that states: "Turn on the switch then touch your fingers to the two copper tube (or you can put the two tubes into water) then power of the boat is on."

WHAT two copper tubes? The prop shafts??

Is there a tie-in for current between the shafts and the power? This is all new to me - sorry for the elementary question, and thanks for any help.

Did all per the "English" instruction as stated (battery pack is charged) and no go. The R/C unit lights up, batt spec says 7.2 V and it reads on mete at 7.72. All that I am not understanding is the message to "touch your fingers to the two copper tube." Rechecked all other connections numerous times, all seems wel but no nuthin when trying to activate the motors/rudder.

See image of label:

I heard of these type of switches before, when you put it in the water it should turn on. Or maybe lick your fingers and touch the two propshafts. I think brass changed to copper in the translation.

THANKS Tombsy, it's a new concept to me, appreciate your advice - I have a river out front, but didn't want to "launch" with no power!

Update: Put it in water, ran great - I NEVER knew these things had some sort of connection between the motors using water as the medium. Thanks again!

Yes, it is a safety feature. The props won't spin unless the boat is in the water. Or you lick your fingers and touch both prop shafts!