For Full Audio System Adjust Volume Without Leaving The Room Rotary 12-position Impedance-matching Auto Former 1x 2x 4x 8x & 16x Impedance Multiplier Smooth Transition Between Volume Steps Freq Resp: 20 Khz - 20 Khz 1 Db 2.63" Mounting Depth Includes Decorator Wall Plates Limited Lifetime Warranty Almond