ECO-WORTHY 12 inch Stroke Linear Actuator 12 Volt Heavy Duty 225 Pounds lbs Maximum Lift with Mounting Brackets Stroke length = 12 inches (300 mm), Travel Speed: 0.39 inches/sec (10 mm/s). Maximum Dynamic Load = 225 lbs (900N), Maximum current draw = 4.6 Amps. Exterior material is 6061 Aluminum. With reliable performance, stable running, the same characteristics of push and pull, and good environment adaptability etc. Widely used in industries, such as electric power, machinery, metallurgy, mine, petroleum, chemical industry, transportation, lifting, construction, food and feed processing and so on. Input Voltage: 12VDC Stroke Length: 12&#034;/300mm Retracted length: 16.8&#034;/420mm Extended Length: 28.8&#034;/720mm Max Push Load: 225 lbs/900N Travel Speed Without Load: 0.39 inches/sec (10 mm/s) Duty Cycle: 20% Limit Switches: Pre-installed Gears: Lubricated Metal Gears Material: 6061 Aluminum Exterior Protection Class: IP65 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.