1PC SHELL: Made of premium PC flame retardant plastic material, with good insulation, high temperature resistance, aging resistance, and safety. The use of silver contacts with terminal protective covers can greatly improve the conductivity and lifespan of the generator changeover switch. 2TWO OPERATING MODES: Dual power automatic transfer switch can be operated automatically or manually, with millisecond switching without power interruption. The compact structure ensures reliable transmission and makes installation and maintenance convenient. Widely used in various situations that do not allow continuous power outages. 3MILLISECOND LEVEL SWITCHING: When the normal power supply encounters an abnormality, the backup power supply immediately starts working, the power transfer switch achieves millisecond switching to ensure continuous, reliable, and safe power supply. 4WIDE APPLICATION: Suitable for emergency power supply systems with rated 220V AC 50 or 60Hz, widely used in various places that do not allow continuous power outages, such as factories, shopping malls, nurseries, etc. 5CONTINUOUS, RELIABLE, AND SAFE POWER SUPPLY: Ensures the continuity, reliability, and safety of power supply by testing the normality of the main power supply or backup power supply. 1 x Dual Power Automatic Transfer Switch 2 x Protective Cover 1 x Accessory 1 x Manual