Features:  -[Built-in limit switches]: Self-locking function. The telescopic rod will automatically stop when it reaches the top/bottom. Make sure the motor will not burn empty.  -[Stop Anywhere]:Cut off the power, it can be stop at any position, with machine lock, safe and secure.  -[Metal gears]:powder alchemy technology, pure metal gears, double strength and toughness.  -[Aluminum Alloy Material]:IP54 protection, is a power unit. The surface has undergone 27 polishing processes, and the structure design is tight.  -[Low Resistance More Power-Saving]: the wire uses oxygen-free pure copper as the conductor, low resistance, durable and safe to use.     Specification:  Material: Aluminum alloy.  Input Voltage: DC 12V.  Rated power: 20W, Max. 30W.  Ambient temperature: -20°C to + 75°C.  Standard protection class: IP54.  Noise level: Less than 42dB.  Stroke length: 150mm / 6inch.  Retracted length: 255mm.  Extended length: 405mm.  Options:  100N 90mm per second /150N 70mm per second /180N 50mm per second / 200N 40mm per second /230N 25mm per second /250N 15mm per second / 300N 30mm per second /500N 20mm per second /700N 10mm per second / 1000N 5mm per second.  Force And Speed:  100N≈10kg / 150N≈15kg /180N≈18kg / 200N≈20kg / 230N≈23kg / 250N≈25kg / 300N≈30kg / 500N≈50kg / 700N≈70kg / 1000N≈100kg.     Produce Included:  1 x 12V Linear Actuator