Using these light - up pop fidget tubes is super easy. Just start popping the bubbles and enjoy the light show that comes with it. Since the batteries are non - replaceable, once they run out, you'll need to get a new set. Keep them away from small children under 3 to avoid choking hazards. To keep them in good shape, don't expose them to extreme heat or cold. Have fun with these fidget tubes whenever you need to relieve stress or just have some fun!