transmission 6 and unlocked without a key a thief cannot easily break it as shown in fig7 9 the invention can be also applied in a door lock 70 installed in a door 7 a control box 72 is set on the inside of a door frame 71 to face exactly to the door lock 70 installed with a mechanism 73 inside it to drive a dead bolt 74 to act the dead bolt 74 is bored with a hole 75 in using a remote controller is used to control the control mechanism 73 in the control box 72 to push the dead bolt 74 outward to pass into the door lock through an opening 76 keeping the hole 75 positioned to face to the dead bolt member 22 rightly next press the button 2 to enter the hole 75 of the locking bolt 74 as shown in fig9 by the time the compression spring 23 is compressed and the locking groove 20 is moved inward to a position exactly corresponding to the bayonet 53 which is synchronously forced by the elasticity of the compression spring 56 to move into the locking groove 20 keeping the button 2 positioned and the dead bolt member 22 extended into the hole 75 of.