1.No backflow protection function. Connecting the backflow protection diode to the output end can charge rechargeable batteries (if you are a professional, you can not connect the backflow protection diode) 2.With MPPT function. Support MPPT solar charging 3.Can connect external temperature probe. Support over-temperature protection. Stick the external temperature probe on the battery. Over-temperature automatically stop charging 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 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 Package Contents: 1 x DC buck-boost power supply Base Plate 1 x Display 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.