PART# ED0001-TSPH heavy duty step up step down transformer 1000 watt 038975489100 Specifications: 110V AC to 220V AC or 220V AC to 110V AC Heavy Duty Transformer for safety and reliability ON/OFF switch with indicator light Universal output receptacles (will accept European 2 round pin plug, North America 2 flat pin and 3 prong plug The transformer weighs 22 lbs It measures 8.25" X 7.2" X 5.75" Safety Features Include: Built-in (non-detachable power cord with strain relief) Fused Protection Safety polarized input switch (100V AC, 200V AC, 220V AC and 240V AC) Non slip rubber feet -rubber feet for non-skid and isolated from ground. -standard US 3-prong plug input, 2 round pin adaptor is included. -universal output receptacles on both 110 and 220VAC (will accept 2 flat pin, 2 round pin, 3 prong US and Australia right angle 2 flat pin. -on-off switch with built-in circuit breaker, -white housing to fit in any decor. -90 days Mfg. warranty. ST-1000 heavy duty step up step down transformer 1000 watt • 110V AC to 220V AC or 220V AC to 110V AC • Heavy Duty Transformer for safety and reliability • ON/OFF switch with indicator light • Universal output receptacles (will accept European 2 round pin plug, North American 2 flat pin and 3 prong plug) SAFETY FEATURES INCLUDE: • Built-in (non-detachable) power cord with strain relief • Fused Protection • Safety polarized input switch (100V AC, 200V AC, 220V AC and 240V AC) • Non slip rubber feet 038975489100 primary and secondary are not isolated The correct term(technical) for ST-series is Autoformer or Autotransformer.