was going to see about purchasing voltmod. But had no idea what I would be purchasing but it looks to me as a glorified doorbell which I can buy from DIY shops at £4.99 hello ding dongs we have to do cut backs to save electricity and if it was that good see Alan sugar he may take you on board. I noticed at the end of my door bell there's a plug in chime I call it bellend it's not charming but is a double of what you are selling, I will save my money and give your mod a miss as I don't feel as if it's past European standards and would be going in blind. From a man who suffers from ringing in the ears. After reading your info I stopped and thought no can do