Zareba G550 Single Swing Gate Opener - Up to 850 lbs. Gate SPECIAL: Receive additional 1 GT1 Transmitter, 1 GKF1 Mini Transmitter, and 1 GKP1 Digital Keypad All Weather Compatible - This arm can handle the cold, heat and everything in between. Adjustable auto close; the gate can either stay open or automatically close after a set time. Solar Capability - you could add a 12V solar panel to charge the battery The Zareba oversized control box protects your battery from corrosion.