An active anti-theft device for protecting movable property having a computer device, at least one stationary connector, at least one portable connector, at least one sensor, a power source and an alarm is described. The active anti-theft device may also have a key switch, remote control and light. The computer device is the central unit which sends a signal to the other components of the active anti-theft device. The stationary connector attaches to a stationary object. The portable connector(s) and sensor(s) attach to various parts of the movable property. The connectors and sensors connect to the computer device by cable connections, which enable the connector(s) and sensor(s) to be connected to and thereby protect various components of the movable property. If a signal sent by the computer device to a connector or sensor does not return to the computer device as predetermined by a monitoring setup, the alarm sounds indicating that a connection to a component has been broken or disabled.