Features High Quality 5V 1-Channel Relay Module: This module offers high-quality performance with a 5V power supply and 1-channel bistable self-locking relay, ensuring reliable and efficient . Convenient Trigger Control: Easily activate the relay by clicking the trigger port to pull it in and hold, and click again to disconnect, providing convenient and intuitive control. and Long Service Life: Constructed with high-quality materials, this relay module is and has a long service life, ensuring lasting reliability for your applications. High Accuracy and Strong Stability: With high accuracy and strong stability, this relay module is easy to install and use, delivering and reliable performance for various applications. Safe Low Pulse Trigger: The trigger mode is a low pulse trigger, providing a more convenient and safer for your peace of mind. Features: 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 stop 3、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, , strong practicality, perfect tool for winch rooler door truck lift. Specification: Item Type: Momentary Switch Station Box Material: ABS Shell Application Scenario: Industrial Control Field Operating Current: 10 (8) A Working Voltage: AC 400V~ (meaning below 400V) Waterproof Grade: IP32 Size: SGKJ-3N: Approx. 13.5 x 6.6 x 6cm/5.31 x 2.60 x 2.36in SGKJ-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 Package List 1 x Momentary Switch Station Box