Thg series step-up & down transformer is specially designed for such electronic equipment whose rated AC voltage different from that of the local net-voltage. They are safe for use within the rated voltage range. ---Input voltage: AC 110v or 220V. ---Output voltage: AC220V or 110V. ---With several plugs and sockets to choice: US/Britain/European/Italy/Australia/South Africa Std. In addition, use double-connector power cord can achieve stepping up or stepping down the voltage in one product. ---With fuse protector. ---With international usually socket and fuse protector as accessory ---Built in AC 110v/220v selector switch. ---Certification:CE ---Patent No.: ZL 00 3 06378.x ---Warranty: 1 year. ---Product list: THG-100W---48*26.517.5cm---16pcs/ctn---20/18kgs THG-200W---48*26.5*17.5cm---16pcs/ctn---28/26kgs THG-300W---31.5*29.5*21cm---8pcs/ctn---22/20kgs THG-500W---33.5*29.5*21cm---8pcs/ctn---26.5/24.5kgs THG-750W---43*21*20.5cm---6pcs/ctn---24/22kgs THG-1000W---46.5*22.5*22cm---2pcs/ctn---16/14kgs THG-1500W---46.5*26.5*22cm---2pcs/ctn---18.5/16.5kgs THG-2000W---46.5*27.5*22cm---2pcs/ctn---23.5/21.5kgs THG-3000W---46.5*29.5*22cm---2pcs/ctn---27.5/25.5kgs THG-4000W---25*22.5*18.5cm---1pcs/ctn---23/21kgs THG-5000W---26.5*22.5*18.5cm---1pcs/ctn---26/24kgs THG-10000W---42.5*32*30cm---1pcs/ctn---36/34kgs