automatic heavy duty swing gates opener is for dual swing gates up to 18feet long or 850lbs each leaf. There is function of adjustable auto-close (0-100 seconds), soft start and stop, to ensure more safety protection and longer life. Opening direction outward or inward is optional. Emergency release key is included in case of power outage. Build in maximum motor running time (MRT 40 second) for multiple safety design . Marine or automotive type battery with capacity greater than 12 AH is required (not included). So it is also workable in rural places such as farm yard , pastures etc. featured in solar compatible, an additional of 20w solar panel as well as a solar controller, can keep the opener system working *one week (10-15 cycles per day) without ac power. (* depending on weather condition). TOPENS AD8S automatic dual swing gate operator consists of 2 opener actuator, 2 remote control, 1 control box, 1 ETL approved AC transformer, 2 emergency release key, 4 warning sign, 1 detailed installation manual, 2 extra “Push to Open” bracket ,2 solar panel(10w) ,1 solar controller and full set installation hardware. Accessories such as photocell beam, external receiver, keypads , vehicle exit wand and electric lock etc. are available which can improve your gate’s performance and functionality.