ECO-WORTHY 12 Inch Linear Actuator 12'' Stroke DC 12V Heavy Duty 330 Pounds Lbs Maximum Lift with Mounting Brackets Retracted length = 16.54 inches (420mm), Stroke length = 12 inches (300mm), Maximum current draw = 3 Amps, Maximum Load = 330lbs(1500N). 12V motor has gearbox and is rated to hold up to 330 lbs when not moving. An all-metal housing and is water-resistant and sealed against dust for rugged durability. Unit can be controlled with a double pole, double throw switch or with the built-in position sensor and optional linear actuator programmable controller. Quiet clean and energy efficient operation. Accurately positions the load at variable and repeatable locations within the full stroke. Package included: 1pc 12V 12 Inch Linear Actuator with 2pcs mounting brackets. Input Voltage: 12VDC Stroke Length: 12&#034;/300mm Retracted length:16.8&#034;/420mm Extended Length: 28.8&#034;/720mm Max Push Load: 1500N/330lbs Max Pull Load: 1000N/264lbs Maximum Load: 1500N/330lbs Travel Speed Without Load: 0.22in/sec (5.7mm/s) Duty Cycle: 25% No-load current: 0.8A Max load current: 3A Protection Class: IP54 Rated Color: Silver The linear actuators are controlled by applying a 12VDC voltage, basically, connect the two wires to a 12 volt battery. For 2pcs actuators, please wire them IN PARALLEL, then connect the wires to 12 volts battery. Reversing the polarity will make the actuator reverse. Red wire to the positive terminal and black wire to negative terminal will make it extend. To make it retract, reverse the terminal connections. The actuator has pre-installed limit switche inside, it cannot be adjustable. It will hold its position when the power is off. It will auto stop when it reaches the end. It comes with mounting brackets.