3.Can connect external temperature probe. Support over-temperature protection. Stick the external temperature probe on the battery. Over-temperature automatically stop charging 2.With MPPT function. Support MPPT solar 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) 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, Manufacturer: Akfldms