Explorer Compass Features: * 2 3/4″ (70 mm) Easy to Read Direct Reading Dial * Easily Installed, Fits 3.75″ (9.53 cm) Mounting Hole * Internal Green Night Illumination * Built-in Compensators to Easily Adjust for Deviation * Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement * Powerful DirectiveForce Magnets for Fast Heading Lock-on * Movable Sun Shield * High Temperature Composite Construction for Extended Operating Range * 100% Repairable * Exclusive 5-Year Ritchie Warranty Approx. Shipping Weight: 1lb (454g) Notes:  Comes standard with 12v lighting. 6 & 24v lighting options are available. Some custom built OEM models may have different lighting.