Heavy duty construction 5,000 lb capacity per jack. Rugged precision drive system. Self-braking for safe operation. Large foot-pads for added stability. Secure, safe mounting system. Corrosion resistant powder coating. Weatherproof sealed head. Features: 12 Volt electric powered. All bolt-on installation. Rear jacks angled to help prevent side-to side sway. Wireless remote control equipped. Safety first, built-in un-hook and re-hook procedure. Easy installation. Wide range of applications. Benefits: Durable high capacity: 5,000 lbs each jack, 20,000 lbs per system. Fast opening speed, up to 4 times faster. Wireless leveling with remote control. Built-in sway control. 2-year limited warranty. Kit includes all parts needed for installation: Front jacks, rear jacks, rear bolt-on mounting brackets with hardware, and 4 large round foot-pads with new style snaps for front extenders. Control box (receiver), remote On/Off panel, and wireless and/or wired remote transmitter. Complete wiring harness for up to a 40-foot trailer. Wires and cords not pictured.