Features: This 24V lock linear actuator with over current protect, short circuits protect, overloads protect, over voltages protect design. The electric linear actuator is efficient power by 24V, wire up the positive and negative poles in correct, apply voltages to the device and will extend, reverse the polarity and will retracts. Make from aluminum and plastic, strong enough and with fashion look. Come with end limit switches that will automatically top when the device arrive end of strokes, ensure the motor will not burn out. Telescopic linear electric actuator have small volumes, wide application, including medically, industrial, agricultural machinery, catering, ventilation facilities. Specifications: Outer Pipe Materials: Aluminum Alloys Black Materials: Plastic Length: about 120mm/4.72inch 24V 4mm 150N Package Includes: 1pc Electric Linear Actuator note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.