1. Module level Maximum Power Point Tracking(MPPT),5-25% more power yield. 2. Real-time panel monitoring, timely warning and positioning the problem. 3. Secure solar system, remote shutdown, elimination of high voltage danger. 4. Flexible system design for maximum space utilization. 5. 25years lifespan, perfectly matching solar modules. This solar optimizer works well with any brand 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. Note:Due to different factory batches, slight differences in appearance labels will not affect the use. Colour:Black Material:Plastic Package Contents: 1 * Solar Power Optimizer 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.