Human-powered Science Energy Stick includes the following features : 

• 3 Quality LED bulbs in red, green and blue colors
• 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 energy stick
• Join with friends and family to create an even bigger circuit
• Features: touch, flash, sound
• Powered by 2 x CR2032 batteries (included)

Material :

• ABS housing in transparent color

Size closed :

• Length of 19.5 cm x Diameter of 3 cm