1. LED colors can be changed to suit your mood. LED lighting, clear to see the way of fish swim is varied and vivid. 2. Easy to use, it is applicable to AA batteries and USB interface. 3. Automatically change colors when it is on or you can select a fixed color. 4. Night effect is more obvious, more realistic and gives people the feeling of being there. Can be a nice gift choice to your friends and family. 5. Beautiful and elegant, perfect for office desks, bedrooms, home, bars, cafes, restaurants etc.