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Mini Laser Pointers, small red lasers, small green lasers, small blue lasers. Most of these mini laser pointers are shorter than 4 inches, in pen-shapes or key-chain-shapes, powered by 1 AAA battery, laser power is lower than 5mW, available laser colors are green, red, and blue, and more shell colors. However, some of these small lasers can be hazardous class 3B lasers. Be aware of the laser label if you are buying for your kids.