These are Tele-Tech's own custom made VU Meters. They are available with either -10db unbalanced, or +4db balanced inputs. There are 2 models, the VU Model 33 approx 3 3/8" x 2" on a 2 space rackmount cabinet, and the VU model 45 which is 4 1/2" wide and 3" high. Guaranteed for a lifetime. The model 33 is only $695.00, and the model 45 is $ 745.00. Below is pictured the Model 33 on the top, Next is the Model 45 and then the rear picture is what is on the rear of both. True response 20 - 20 KHz with 0db loading.