Features: This microed bistable relays module features a convenient single button start or stop function with auto locking design, enabling users to easily toggle device power without continuous pressing for efficient control. Low power consumption for extended battery life, a compact size for seamless integration into tight spaces, and high reliability to ensuring stable, long lasting performances in various setups. Ideal for enthusiasts, electronics hobbyists, and professional developing home automation systems or smart devices that require simple, effective switching solution. Perfect for applications like smart home controls, robotics projects, and other environments where space constraints demand reliabled, compactly power management. With its bistable functionality and durability construction, this relays module offering a user friendly way to enhancing device operating in everyday electronic designs. Specifications: [Component]: PCB [Product size]: 1x1cm, 2.1x1cm [Product weight]: 3g, 6g [Input voltages]: 3V~5V ；7V~28V Optional [Output current]: 1A~3A, 2A ( 4A most) Package Includes: 1PC Single-button bistable relays module note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution