With the advanced Barometric pressure technology, it enhances the shooting stability during hover function and reduces the blurring of shooting due to the shaking of the helicopter. When the helicopter battery is low, the helicopter indicator lights will start flashing. Please return your helicopter to a safe location and land it when you see this warning sign-on. The helicopter will lose its altitude and land gradually after its low voltage battery protection is activated. When the helicopter is flying, yet the propellers collide with any objects or jammed, then its overprotection will be activated.