energy output by reducing negative effects caused by shading, mismatchloss, different orientations, and other issues. The advanced module-level monitoring enables users to track module operation statusin real time and shutdown the system in case of any hazards.Making maintenance much and efficient. This solar optimizer works well with any of string inverter on the market. Using this optimizer can improve the conversion efficiency of solar energy, does not take up space, and is very suitable for home and courtyard use. Application:Solar System Controller Colour:Black Material:plastic Package Contents: 1 x MPPT Solar Module PV Power Optimizer(Due to different product batches, the appearance , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.