1.With Laser pointer function 2.With PDA Pointer function 3.With ball pen function Class III, < 5 mW product avaliable. Class II, < 1 mW product avaliable. 4.Use writting fucntion by twisting the lower pen body to left side. The ball pen refill will come out. 5.Use PDA pointer function by twisting the lower pen boday to right side. The PDA pointer wiht come out. 6.Use Laser pointer, simply press the button on pen body.