State of Assembly:
Material: Plastic + electronic components
Color box size: about 37276cm/14.5710.632.36in
Product size: shark: about 16278CM/63.7830.71in
Battery: 4*AAA batteries (NOT INCLUDING.)
Remote control maximum sensing distance: 65M
Remote control functions: Climb up, drop, and tail control
Range: Up to 40 feet
It must be used with helium, not hydrogen. The hydrogen is flammable. Helium is a kind of inert gas, which is safe and reliable.
Do not inflate it too full due to the thermal expansion and contraction of the gas.