The 2711-K3A2L1 is a discontinued PanelView Standard operator interface featuring a 3.3-inch monochrome display with 128 x 64 pixel resolution, keypad input, and DH-485 communication protocol. This PanelView 300 series unit operates on 24 VDC power supply. While the original manufacturer warranty is no longer valid, it comes with a 2-year warranty from Radwell.