The Dalite 87935ES Horizon Electrol Motorized Masking Projection Screen gives you the creative freedom to mask your screen to any of four factory pre-set aspect ratios. The benefit of having a masking screen is that it saves you the cost of purchasing several different screens to accommodate various formats.
The motor is oiled-for-life and contains a thermal overload cutoff system that helps prevent burnouts. The braking system is sophisticated and will stop the screen where you want it without any "coasting".
The Horizon is designed so that the masking is maintained flush against the screen. In this way, shadows are kept to a minimum, thereby assuring a smooth, uninterrupted projection. The screen includes a six button switch for opening and closing. The switch also controls "halt" when your screen meets the format required.