The Silver generator was shipped promptly... The unit was well-built able to take knock the transformer is also a quality one I would have prefered if they had packed it a bit better like a ore padding or a little box. Was Advised for Gold a different transformer was available so that’s bonus if i ever want to make gold then all i have to do is buy some gold strips and buy this other transformer and am away, Will consider this in the near future. The unit is delight to use, Just set and Go. Either you can put a timer on plug 4 - 8 hours for 16ppm and 25ppm from 1 litre Distilled water. Either the timer or it also a a visual indicator a green light which becomes as bright as the standard red light when all is done and that it could not believe how simple it was to make. Alan of Pro Colloidal Silver comes across as friendly and well inform chap so most pleased with unit and what it can do glad I bought it.