The 4pk has also got:
40-model memory;
2048 resolution for more precise servo movement;
MCLink function to connect between two 4pk for data transfer or direct connect to some Futaba ESCs for adjusting the setting without the use of PC;
lighter weight,more balance design;
the drop wheel adaptor can be moved right or left as well as changing angle; and
trigger position can also be adjusted, by as much as 7 mm.