3.Can connect external temperature probe. Support over-temperature protection. Stick the external temperature probe on the battery. Over-temperature automatically stop charging 1.No backflow protection function. Connecting the backflow protection diode to the output end can charge various rechargeable batteries (if you are a professional, you can not connect the backflow protection diode) 2.With MPPT function. Support MPPT solar 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, Weight: 0.7275254646 pounds, Manufacturer: Awwertse