Power Ten Inc 50V 20A programmable DC power supply, model number 3300I-5020. Appears new / priced as used because we're unsure. Input voltage: 100-120VAC. Includes IEEE 488.2 interface. To view the full product manual for the 3300-5020 unit (PDF), click here. To view instructions for the IEEE 488.2 programming interface (PDF), click here. Please note that Power Ten is now part of the Elgar/Xantrex/Ametek brand.