These go over your grips. They are hot. They come off easily if you want to take them with you. Think that’s it. £30?
Attachments
Does one need to plug them into the bike? How easy is that to do?
Two wires to the battery
That a good idea for a quick winter fix.
I’m considering something like this, as I love my renthal grips but want some extra warmth. I’ll take 'em. Used much?
Sold
Sold
They would make great willy warmers
If they fitted then aye 
Although you’d have to carry a 12v battery around in your pants.
Short cable then?
I remember the first mobile phones, built like an house brick and you had to carry what amounted to a car battery around to power the things. Came with a long enough cord to park the battery on the pavement and roam to the centre of the street for best reception while screaming
“Hello? Yeah, I’m in the cinema. No, it’s RUBBISH!”