Brand new Circuit board with two remote controls. Motor working and auto-off times can be changed. Remotes control has a single or three button mode and work on 433.92 MHz frequency. Can be used with spring or magnetic limit switches. Uses STD 110V to control gate motors. Infrared sensors can be purchased separately for $10 more to reverse the closing automatically for safety reasons. PY600ac SL600 SL1500 PY800.