This is a Posmith Dual Power Automatic Transfer Switch (ATS) designed to switch between two power sources, such as utility power and a generator.The model shown is rated for 100A, indicated by "ATS-100A/2P" on the green label, and features a 2-pole configuration.It includes both a manual override lever for immediate control and an "Auto/Manual" switch for automated operation.The device is intended for single-phase electrical systems and supports a nominal voltage of 230V, with a switching speed sufficient for most household appliances.