Ed’s laser pointers with integratedvheater straps and powered from 12V car battery thay he madr for Damian and myself are fantastic. However the power transistor gets quite hot so he came around yesterday and swapped the transistor for a small board that switches power on and off at high frequency so that less power is used and it does not get hot. Works brilliantly! Thanks Ed. This is what we should be able to buy commercially but can’t….