Converter Travel Adapter Converter Efficiency Power Transformer

SWEDISH - I tested this product and it delivers what was promised. Be aware that it is an "autotransformer", which means the output is 115 VAC but one output terminal is 230 VAC relative to ground, depending on which direction you plug it in. The output is NOT isolated from the input current - this is normal. Internally, there is space on the transformer core to add more turns of wire, so if you are a bit handy, you can convert it from 230 VAC / 115 VAC to a lower voltage of your choice. I will rewind mine for 24 VAC secondary voltage. You DO NOT need to break the casing as there are two mounting screws. Internal black wires=230V, red wires=115V. Add 17 turns per volt to create another secondary winding. There is 52 mm² left to add a new winding. I am 100% satisfied with this product ENGLISH - I checked this item and it delivers that which was promised. Be aware that it is an "auto-transformer", which means that the output is 115VAC but one output terminal is 230VAC with respect to ground, depending on which way you plug it in. The output is NOT isolated from the input power - this is normal. Internally there is space on the transformer core to add more turns of wire, so if you are a little bit handy then you can make this into a 230VAC / 115VAC to a lower voltage of your choosing. I will be re-winding mine for 24VAC secondary. You do NOT need to break open the case as there are two fixing screws. Internal black wires=230v, red wires=115V. Add 17 turns per volt to make another secondary. There are 52mm² space to add a new winding. I am 100% satisfied with this product. Harry L