|GTO Gate Timer, GTO TM-GTO-12V Automatic Gate Timer. GTO PRO Gate Timer - TM-GTO-12V . The GTO Gate Timer 12V 7-Day Timer is used to program time periods that your gate operator will open or close. Capable of keeping your gate open for extended periods of time, saving excessive wear on the operator by eliminating the constant opening and closing of the gate. Can also lock out the use of the operator for security concerns during the evening. Timer accepts up to 10 program settings. Low voltage DC timer made to hook up to GTO operator battery without draining the battery. Easy installation instructions included.