well the external design is ok but the one I received is really DANGEROUS, either by a default or by design. but if I remove the plastic button (by easily pulling it, easy for a child!) there is full electrical power just there on the rotary switch. I think it is a defect but I'm unsure, so be careful if you buy one! and test that. this makes the device unusable. I had a partial refund with the dispute.
Product need to be improved. Fuse is to week, does not support peak current on switch ON. Seller is the best one. Accept fast local return. 100% of order refunded. Honest seller!