Easy installation. All you need is a 19mm (3/4 inch) hole and the switch installs well, no more square cutouts. Switch with a kyhole slot to prevent unwanted rotation SPST 2 poles (On/Off) 3rd pole with LED to connect to ground. Functions: It can be applied as the switches for the additional electronic equipment inside and outside the car. (Such as flashing lights, chassis lights, and dome lights) Condition: 100% Brand New Color: Black and Blue Material: Plastic LED Color: Blue LED Size: 2.3 x 2.5 cm Quantity: 25 pc Rating: DC 12V 20A Type: 3 Pins SPST: ON-OFF Note: 1. Instruction is not included, professional installation is highly recommended. 2. Please check the size measurement chart carefully before making payment. Package Included: 25pcs Blue LED Round Switch (Waterproof) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed