Features: Integrate chip with double mode /bluetooth-compatible connectivity and 30amp load capacity, enabling secure remote control for heavy duty appliances through / Home integration. Engineered with 4 fiberglass substrate for superior insulation and 176°F heat resistance, featuring screw design for tool easy installation in existing electrical device . Ideal for smart home enthusiasts, professional electricians, and industrial automation engineers requiring stable high current switching solution. Perfect for controlling air conditioners, water heaters, or industrial machinery in residential, commercial, and activates environments. This relays module combines industrial grade durability with flexibility, supporting MQTT/ protocols for seamless integration into automation projects. Specifications: Component : fiberglass board Size: about 4.7x7.8cm/1.85x3.07inch Package Includes: 1xRelay Module note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.