The Aurora Lasers allow you to stay US-legal and compliant easily by only working horizontally and being a proper US-legal laser. They offer basic patterns via sound-active and DMX modes and are great for scanning, liquid sky, and other similar effects. The Emerald offers a strong, green laser! From the Manufacturer: X-Laser Aurora models are quad-aperture lasers that can captivate audiences in an entirely new way. Re-engineered from the built-in patterns up, the Aurora Emerald creates intense green liquid sky and aerial effects while providing a safer, brighter and more cost-effective laser experience for users of any skill level. By removing the Y-Axis, Aurora Emerald users can now create stunning, vividly bright, room-filling aerial effects more easily and affordably than ever before. Quad-aperture design for maximum beam pattern and liquid sky room coverage Completely re-engineered, Aurora-optimized patterns for the highest possible brightness and endless variations More power and more brightness than any Aurora models before them Deep DMX control allows for creative effect design, while maintaining affordability and simplicity Engineered to be the simplest and safest way to produce liquid sky effects Extremely wide sweep effects can blanket an entire venue and look especially intense with multiple units Control modes: 9-channel DMX, Demo and Sound Active via DMX Safe for temporary outdoor events as Aurora lasers cannot accidentally scan up into the sky, when rigged securely. Double quality checked in a 26-point inspection prior to shipping X-Laser no-hassle warranty eligible (6 months for diodes, 1 year mechanical) Class 3B High-Powered Laser; FDA Variance required. EZ Variance Kit available separately In the Box: (1) Aurora Emerald (1) Power Cable (1) Black Wrap beam blocking foil Features: Power: 280mW Beam Source: Direct-injection DPSS diode Beam Specs: 1.5-3 mRad Scanners: Open-loop micro stepper motors Diodes: 532nm green Cooling: Filtered forced air Control Protocol: DMX Operating Modes: DMX, Sound Active IP Grade: IP20 Class 3B High-Powered Laser; FDA Variance required. EZ Variance Kit available separately