This 1pc 12mm small push black button switch is a selflocking fixed latching push button with a big ball head, designed for doorbell and access control applications. Its compact form and reliable latching action provide a straightforward user interface for controlled entry and security systems. Key benefits Selflocking fixed latching action for clear on/off state and intentional operation Large ball head offers comfortable, precise control with tactile feedback Compact 12mm mounting diameter fits tight panels and small devices Neutral black finish blends with most decors and installations Suitable for doorbell and access control setups, delivering dependable performance in everyday use Simple, onepiece design supports straightforward installation and maintenance Key attributes Type: Push button switch Action: Selflocking fixed latching Head: Big ball head Mounting diameter: 12mm Color: Black Quantity: 1 piece Applications: Doorbell, access control, security panels, DIY electronics Mounting notes: Designed for panel installation with a 12mm mounting hole What makes it useful Reliable door control: Activates a door release or bell function with a deliberate push, then remains engaged until pressed again to reset. Access control interfaces: Provides a clear, tactile control point for entry systems and security panels. DIY and hobby projects: A compact, latched button that works well in custom control boxes, arcade cabinets, or prototype panels. Use cases Door entry systems: Use as a secure pushtorelease or pushtoactivate control for entry doors in apartments, offices, or gated properties. Security and access panels: Integrate into alarm or access control stations where a latched push button indicates an active state or triggers a lock release. DIY electronics and projects: Ideal for compact enclosures, control boxes, or custom gadgets where a durable latched push button is needed. Package contents 1 piece push button switch Notes Please verify mounting hole size and clearance in your enclosure to ensure proper fit. Electrical ratings and terminal configurations are not specified here; refer to your project requirements and the product documentation for compatibility.