Abstract: A portable safety device for outdoor use comprising: a first shell and a second shell; two grooves respectively disposed in the first and second shells; a switch disposed on the first shell and exposed to the outer environment of the first shell; first and second conductive plates disposed on the first shell and electrically communicated with each other by the switch; a cylindrically lighting means disposed between the first and second sheels and one end thereof protruded from the combination of the first and second shells; fixing means disposed on the other end of the combination of the first and second shells for connecting the lighting means, and the first and second shells together; a telescope movably disposed upon the lighting means and having an open position and a closed position wherein at one end thereof is an object lens and at the other end is an eye lens; a slidably elongated means provided on the object lens of the telescope for slidably moving the telescope from the closed position to the open