Item Type: Mini Electric Linear Actuator Material: Aluminium Alloy Working Voltage: DC12V Stroke: Approx. 50mm / 2in Distance Between Two Installation Centre Holes: Approx. 105mm / 4.1in Noise: 55dB Maximum Waterproof Grade: IP54 Application: Smart smoke extractor, window opener, robot, home automation. Package List 1 x Mini Electric Linear Actuator 2 x Mounting Rack 1. Before use, confirm whether the motor voltage is correct.2. Do not store or operate in a high temperature or humid environment, and do not place it in corrosive gas, which will reduce the efficiency of the motor. 1Can be used in agricultural machinery, construction, cleaning and sweeping vehicles, ships and so on. 2You can also use it to replace hydraulic and pneumatic products, suits for saving energy consumption. 3The low noise operation is very smooth and safe, and when it reaches the top, it will stop automatically. 4Has overcurrent protection, short circuit protection, overload protection and overvoltage protection. 5Premium aluminium alloy material with IP54 waterproof grade ensure great durability for longterm use.