DA391, 12V DC (13.7) PSU, 1 X 4A Fused Output, Metal Cased Enclosure Dantech Dantech Electronic Engineering. Specialists in the design and manufacture of electronic equipment for the security industry. Dantech Website PRODUCT DATA SHEET FOR DA391.pdfDetailsDescriptionDANTECH DA391 DA391, 12V DC (13.7) PSU, 1 x 4A fused output, will house and charge one VRLA battery up to 7Ah capacity. Typical uses are for powering door access controllers, electric releases, maglocks and CCTV cameras. Metal cased enclosure.