Acer X1129 is a DLP projector known for its high brightness and contrast, making it suitable for presentations in medium-to-large rooms with ambient light. It features SVGA (800x600) resolution and supports technologies like ColorBoost3D and LumiSense for improved image quality. 

Specifications
According to the Acer product page and various retailers, the specifications for the Acer X1129 projector include: 
Feature     Specification
Model    X1129HP
Projection System    DLP
Native Resolution    SVGA (800 x 600)
Maximum Resolution    1920 x 1200
Brightness    4800 ANSI Lumens (Standard Mode)
Contrast Ratio    20,000:1
Aspect Ratio    4:3 (Native), 16:9 (Supported)
Lamp Life    5,000 hours (Standard), 10,000 hours (ECO), 15,000 hours (Extreme ECO)
Image Size    23 to 300 inches
Connectivity    2x HDMI (X1129 version), 1x HDMI (X1129HP version), VGA In/Out, USB, Composite Video, RCA, Audio In/Out
Built-in Audio    3W mono speaker
Weight    Approximately 2.4 kg