This product is a 1 piece 16MM momentary push button switch with blue LED lighting, model R16503, featuring a 4pin configuration. Its compact 16 mm diameter makes it suitable for tight panel spaces while providing clear visual feedback with blue illumination. Key benefits Momentary action for precise control: the switch returns to off when released, ideal for start, reset, or trigger functions. Blue LED illumination offers immediate status indication and adds visibility in low light environments. 4pin configuration enables straightforward wiring and compatibility with common LED and switch circuits. Compact footprint fits in tight panels and enclosures without crowding adjacent controls. Simple wiring supports quick integration into projects or existing control panels. Key attributes Type: momentary push button switch LED: blue lighting Size: 16 mm diameter Pins: 4pin connector Model: R16503 Quantity: 1 piece Compatibility and use cases Electronics projects and prototyping, including microcontroller interfaces (Arduino, Raspberry Pi) for reset, start, or user input Control panels and automation setups that require a momentary input with a visual indicator Arcade cabinets, DIY gaming controllers, or other hobbyist builds needing a compact illuminated momentary switch What you get 1 x R16503 16 mm momentary push button switch with blue LED, 4pin This description reflects the product brand, specifications, model, and features as provided.