This bistable relay module provides a compact, singlebutton solution for car modification projects. With a bistable (latching) design, a single press toggles the circuit and the state is retained until the next action, making it suitable for startstop style control in DIY installations. The module supports 5V and 12V systems, expanding compatibility with various vehicles and electronics. Key benefits Simple onebutton control: toggle the output with a single press for easy startstop style operation. Latching reliability: bistable design maintains the switched state without continuous coil power, helping reduce power consumption in use. Startstop capable: designed for car modification applications to achieve startstop functionality with a selflocking action. Broad voltage compatibility: supports 5V and 12V systems, enabling use in a range of automotive and electronics setups. Ready for installation in a 1piece package: convenient for DIY projects and quick integration. Attribute alignment with listing: Color specified as 24V in the product listing to match required variant. Key attributes Functionality: bistable relay module with singlebutton control for startstop and selflocking operation. Compatibility: operates with 5V and 12V systems; intended for car modification uses. Size: not specified in the listing. Material: not specified in the listing. Performance: designed to provide reliable latching switching for automotive modification scenarios. Pack quantity: 1 piece per . Color variant: 24V as listed. Use cases Startstop car modification: wire the module into a vehicle's control circuit to enable a singlebutton start/stop function with a selflocking action, suitable for custom dashboards or prototype builds. Singlebutton accessory control: use the module to toggle auxiliary circuits or accessories (such as lighting or devices) with one press, simplifying cockpit wiring. DIY automotive projects and testing: employ the module in development harnesses or experimental setups to simulate startstop behavior or to test latching control methods without constant power draw. Notes The listing specifies voltage options of 5V and 12V and a color attribute of 24V; size and material details are not provided in the description and should be confirmed in the product package or full specification sheet before . This description reflects the product's stated brand features, model characteristics, and functional capabilities as indicated in the title.