Product: 1pc 16MM PB1605AD yellow locking pushbutton switch with 3V light, round head Why this switch helps Provides a clear, physical on/off control that locks in place when activated, preventing accidental changes and giving reliable feedback that a circuit is engaged. Builtin 3V indicator light instantly communicates status, improving visibility in lowlight conditions and reducing troubleshooting time. Compact 16MM round head design fits standard smallpanel cutouts, making it easy to integrate into control panels, instruments, and DIY projects. Key features and attributes Model: PB1605AD Quantity: 1pc Size: 16MM mounting diameter (standard smallpanel size) Head style: Round head for a clean, professional appearance Function: Locking pushbutton (push to lock on and push again to release) Indicator: Integrated 3V light for status indication Color: Yellow — visible for status or warning indicators Mounting: Designed for panel installation (16MM cutout compatibility) Benefits and practical advantages Visible status: The 3V light provides immediate confirmation that the switch is active, useful for machine status, alarms, or indicator functions. Secure operation: The locking action keeps the circuit engaged until intentionally released, which is useful where steady on/off state is required. Spaceefficient: The 16MM form factor preserves panel space while maintaining usability. Ease of replacement or upgrade: Standard 16MM size and round head styling match many existing panel layouts for straightforward installation. Typical applications Control panels and operator consoles where a clear, locking on/off control is needed along with a visible indicator. DIY electronics, hobby projects, or instrument enclosures that require a compact, visible switch solution. Small appliances, test equipment, or industrial devices needing a yellow status/alert switch with locking function and integral 3V illumination. Installation and compatibility tips Designed for a standard 16MM panel cutout; verify panel thickness and cutout size before installation. Use the yellow round head to designate a specific function (e.g., caution, standby, or alert) for consistent operator recognition. Confirm wiring and the 3V indicator supply with your application requirements to ensure correct illumination. What you get One PB1605AD locking pushbutton switch, 16MM, yellow, with builtin 3V light and round head — ready for panel installation and immediate use.