Please note, the PV INVERTER type must connect the inverter as the A source, with the inverter and PV system serving as the main power. The stable grid power serves as the B source. The intended use is for photovoltaic as the primary power source and utility power as the backup, with a dual power switch. PC level, no interruption. For PV system and inverter to city power applications only, not for city power and generator to city power and generator. Batch numbers may vary across different production batches; this does not affect product performance. Type: 63A Color: White + Black Material: PC Size: 107 x 96 x 76mm Package Contents: 1 x Automatic Transfer Switch Only the above package content is included; other items are not included. Note: Lighting and display differences may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement error allowance is +/- 1-3cm.