latching wall 292 the second resisting end 283 is exposed from the fixing member 29 the fixing walls 294 are welded to the slide plate 22 the body 2611 is received in the cavity 281 and the second column 262 abuts against the wedge surface 284 the button 25 is attached to the second housing 30 the button portion 251 is received in the opening 331 the rods 252 are fixed to the posts 332 the second housing 30 is attached to the slide plate 22 the second resisting end 283 abuts against the resisting portion 254 thus the slide mechanism 20 is at a closed position and the portable electronic device 100 is at a closed state referring back to fig8 when the slide mechanism 20 is to be driven from the opened position to the closed position the button portion 251 is pressed to force the contact block 28 to move the wedge surface 284 causes the second column 262 to push the first column 242 to move away from the second hole 223 to unlock the main plate 21 after that the slide plate 22 automatically slides further relative to the main plate 21 when the slide mechanism 20 is.