The Bosch LTC2821/91 is a high resolution 21" color monitor designed for CCTV applications where performance and reliability is a priority. The monitor features a built-in speaker with volume control, 2 loop-through video and audio inputs and is compatible with both NTSC and PAL systems. An all metal casing provides structural integrity and minimizes electrical interference. Front panel controls offer easy adjustments for volume, sharpness, brightness, contrast, color, and tint. The monitor is easy to install and operate with a user-friendly on-screen display, 120-230 VAC power inputs and built-in transport handles.