Modular: Use as a single unit (10"), Combine up to 4 for 40'' of width, or double stack for 10'' or 20'' double height mounting. Easy wiring: Use the provided DT wiring harness to wire your lightbar, plugging it on any side of the lightbar. No need to individually wire each light bar when the are modulated: Use the link harness to loop the power from one lightbar to the next. Heating: With the use of the built-in temperature sensor, the lightbar will begin heating when the ambient temperature is below 5°C (41°f), avoiding frost, snow, and ice accumulation on the lens surface. Design: Entirely designed in a high grade aluminum, resulting in high heat dissipation. Equipped with a screwless frame for a sleek design. Power: Comparable to 8500 lumens for the 10'' and 17 000 lumens for the 20''. Reliability: 100% waterproof, resistant to mud, snow, shocks, vibration and dust. Can tolerate weather conditions from -40c up to + 80c. Color: Cold white 5500-6500K. Spot beam: Aim your light beam on the road and when installed correctly, they will not blind drivers in the opposite direction.