1.Without anti-backflow function, the output end is connected to the anti-backflow diode to charge rechargeable batteries(If you are a professional, you can not connect the anti-backflow diode) 2.With MPPT function, support MPPT solar charging 3.Can connect external temperature probe to support over-temperature protection. Stick the external temperature probe on the battery to automatically stop charging when over-temperature 4.Note: This product has no output reverse connection protection. Reverse connection of the positive and negative poles of the battery damage the device. Battery charging requires certain professional knowledge. Non-professionals should not charge directly to prevent fire and explosion<br><br>Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: As Shown Material: PCB+Plastic+Electronic Components<br><br>Package Contents: 1 x DC buck-boost power supply Base Plate 1 x Display<br><br>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.