Hitachi"s hybrid filter consists of a two-stage, layered design and an electrostatic filter, providing dust protection. Hitachi CP AW251N features 2000:1 contrast ratio, contrast can be automatically controlled through an active iris to add depth perspective during both bright and dark scenes. PJMessenger function allows you to send and display text messages and audio alerts on your networked projectors. It is an easy and efficient way to send campus wide announcements. Product Description: Hitachi CP AW251N - LCD projector Device Type: LCD projector - High Definition 720p Built-in Devices: Speaker Dimensions (WxDxH): 13.6 in x 11.9 in x 4 in Weight: 8.6 lbs Networking: Ethernet, Fast Ethernet Image Brightness: 2500 ANSI lumens Image Contrast Ratio: 2000:1 Resolution: WXGA (1280 x 800) Native Aspect Ratio: Widescreen Color Support: 16.7 million colors Lamp Type: 210 Watt Lamp Life Cycle: 4000 hour(s) / 5000 hour(s) (economic mode) Video Input: RGB, S-Video, composite video ( NTSC, SECAM, PAL, PAL-N, PAL-M, NTSC 4.43 ) , LAN Digital Video Standard: High-Definition Multimedia Interface (HDMI) Video Modes: 480p, 720p, 1080i, 1080p, 480i, 576i Video Output: RGB Audio Output: Speaker(s) - integrated Sound Output Mode: Mono 10 Watt Input Device: Remote control Power: AC 120/230 V ( 50/60 Hz ) Power Consumption Operational: 310 Watt Manufacturer Warranty: 3 years warranty General Device Type: LCD projector - High Definition 720p Built-in Devices: Speaker Width: 13.6 in Depth:<