![This on/off plunger is next to the switch for my pool lights, but I don't know what it's for (just bought the house) and don't want to mess with it and break This on/off plunger is next to the switch for my pool lights, but I don't know what it's for (just bought the house) and don't want to mess with it and break](https://i.redd.it/ursb87sd80351.jpg)
This on/off plunger is next to the switch for my pool lights, but I don't know what it's for (just bought the house) and don't want to mess with it and break
![wiring - Replacing pool light switches with smart switches... is this correct? - Home Improvement Stack Exchange wiring - Replacing pool light switches with smart switches... is this correct? - Home Improvement Stack Exchange](https://i.stack.imgur.com/0Iar3.png)
wiring - Replacing pool light switches with smart switches... is this correct? - Home Improvement Stack Exchange
![Underwater Lighting 15W RGB Swimming Pool Light Resin Filled 12V Switch on/off Control IP 68 Waterproof - AliExpress Underwater Lighting 15W RGB Swimming Pool Light Resin Filled 12V Switch on/off Control IP 68 Waterproof - AliExpress](https://ae01.alicdn.com/kf/H2771e42577ea400b8c703175111d3dc71/Underwater-Lighting-15W-RGB-Swimming-Pool-Light-Resin-Filled-12V-Switch-on-off-Control-IP-68.jpg)