D1388-1 Vertical Auto-Desiccator Cabinet features a permanent silica gel contained in the control unit. No desiccant tray is needed. The cycle is indicated by a green light for a 4-1/2 hour absorption period, or a red light indicating 1/2-hour regeneration of the silica gel. Dial hygrometer is located in the door. This cabinet will lower relative humidity 30-40%. Exterior dimensions: 12¬Ω" W x 15¬Ω D x 20" H. 120 VAC. D1388-2 is the horizontal version with the same features as D1388-1. Exterior dimensions: 15¬Ω" W x 19¬Ω D x 13¬º" H. 120 VAC.