the LEDs are very powerful because there are 6 and 6 volts pushed to 7.5v at maximum capacity and it heats the piss but it is bearable. The pain is rather at the attachment of the tip of the foreskin and in the tight skin and the clicking of certain small vessels but this torture gives good sensations and great pain with each exit of piss from the bladder until the delivery when the loose knot. Having a large bag of skin I managed to do a long and beautiful CBT