Do you know how to choose a Real 4K action camera ?
In Current market , which chipset can use for the real 4K action camera ?
 
1) Made by Hisilicon 3559  cost $30-$35/pcs 
Even there are some bugs after 2 years promotion 
 
2) Sunplus V39 , cost  $40-$45/pcs 
 
3) Ambarella H22  ,only xiaomi use this chipset 
 
4) All winner V316  4K 60fps ,real 4K 30fps , cost $25-28/pcs 

5) Mstar ,Real 4K  ,with EIS ,External Mic ,cost $25-$28/pcs .

So i think mstar is the best optional , ours' model no AO-01 is made by the mstar chipset .