The Blue Bird is a bead annealing kiln designed and manufactured by Paragon in the U.S.A.Each door measures 2 3/4" x high x 10" wide, double door gives 20" in total.It has a user friendly 3-key Sentry Xpress digital controller.It will easily reach and maintain the bead annealing temperature you need.A great kiln if you wish to teach pupils.The kiln operates on a standard household mains plug socket and costs are very , very cheap to run.Specs are,Max temp 648C / 1200F,Single phase electric power, Internal measurements are 127mm deep x 127mm high x 508mm wide. External measurements are 966mm wide x 458mm deep x 356mm high.Designed for long life with a stay cool exterior shell. This kiln carries the Paragon standard 12 month warranty.