Toysmith Sci-Fi Tube Activate this tube's sound and light effects using only touch with this human-powered tube. Touch both silver contacts at the same time to complete the circuit of the Sci-Fi Tube. Join with friends and family to create an even bigger circuit. Batteries are non-replaceable. This set is recommended for ages 5 years and up. Challenge your children's imaginations and keep them active with Toysmith. Committed to providing the most imaginative toys along with the highest safety standards, Toysmith has toys appropriate for all age groups. Toysmith offers toys for any kind of play: active play, science and discovery, arts and crafts, impulse and novelty toys, and nostalgic retro classics.