Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Please , PV INVERTER type have to Inverter for A source, Inverter and PV system as main . The stable grid for B source. The purpose of is photovoltaic as the main source, and the backup source is the utility Dual switch. PC level, no Interrupt. Only for for PV system and Inverte to , not for and Generator to and Generator. Different batches, the batch number characters on the product may be different, it does not affect type:63A Colour:white + black Material:PC Size:107 x 96 x 76mm Package Contents: 1 x Automatic Transfer Switch Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.