Side By Side Comparison of Kestrel KM 451 and Maxx Mobile AX40. Compare Processor, display, RAM, Storage and other features here. You can quickly compare Kestrel KM 451 and Maxx Mobile AX40 smartphones just by looking at their ratings and results showing "winner" and "runner up." There is also a short analysis comparing different features of Kestrel KM 451 and . You can also look at each hardware feature individually to perform your analysis while comparing mobile phones.