The Dalite 121 x 216" Professional Electrol Motorized Projection Screen is a large screen suitable for venues such as auditoriums, and theaters. This is a rugged screen designed for heavy-duty use. The motor is inside the roller and is supplied with a quick reversal function. In addition, it features an automatic thermal overload cutoff to prevent accidental burn-outs. The braking system is designed to eliminate "coasting". The handsome case is wood and coated with a black primer which can be finished as you see fit. The Professional Electrol includes a three-position Decora style wall switch or can also be controlled with Dalite's Video Projector Interface, Single Motor Low Voltage Controller as well as Dalite's many Integrated Screen Control products for more sophisticated control and networking.