Feature:1. This self recovery button switch is ideal for for 3 way/4 way crane, rolling door control, etc.2. Three keys: you can press up and down according to the arrow to start, press the red key to stop3. Four keys: first press the green start switch, then press the up and down arrows to switch to work, press the red key to stop.4. Waterproof grade IP32, excellent product performance, waterproof, dustproof, and anticorrosive.5. ABS shell, high hardness, protective function for switch, durable, strong practicality, perfect tool for winch rooler door truck lift.Specification:Item Type: Momentary Switch Station BoxMaterial: ABS ShellApplication Scenario: Industrial Control FieldOperating Current: 10 (8) AWorking Voltage: AC 400V~ (meaning below 400V)Waterproof Grade: IP32Size:SGKJ-3N: Approx. 13.5 x 6.6 x 6cm/5.31 x 2.60 x 2.36inSGKJ-4N: Approx. 16.5 x 6.6 x 6cm/6.50 x 2.60 x 2.36in.Package List:1 x Momentary Switch Station Box