Function: 1.If you forget to close the for windows , you just need to press the "lock" function, then the four for windows will be turn off. 2. Pause function :you can press unlock or lock to suspend it ,When the for windows are closing or opening. Instructions: 1.There is 30 seconds waiting between close and open when you use it at first for time. 2. Close function: the four for windows will be closed after you press "lock" function for 3 seconds. 3.Open function: the four for windows will be opened after you press "unlock" function for 3 seconds. Installation: Install it into the original car OBD interface in the state of flame ( The OBD interface was located on the center console lower left corner) And then you can use it after starting the engine Suitable: For Cruze (2009-2014) / Malibu (2009-2015) For Buick for Excelle GT / for Excelle XT / New Regal (2009~) / New Lacrosse (2009~) / New GL8 / Encore Specifications: Material: Plastic Color: Black Size: 4.8cmx2.5cmx2.5cm(LxWxH) Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 x Closer Controller