The US version of the LaserCube 2.5 Wifi has been modified to comply with FDA regulations, the interlock circuit has been modified to meet the standards required for Class 4 systems with a reset requirement and emission delay. This does not affect the operation of the device other than the emergency stop system.
The US-version of LaserOS software has the burning and targeting features disabled. This is also due to US laser regulations and product liability concerns. There is no hardware or other restriction preventing US version LaserCubes from running the international version of LaserOS software which contains the burning and targeting modes.