A actually it depends , it depends what kind of functionalities you want to add into it ,
Yep.
for example if you add two more functionalities then better you add two more buttons , or  and you'll have L_C_D_ display which is  that is going to bring the cost by two two Euros at least.
Mm. Yeah. I think , unless we can really drive these prices down we need to get rid of the L_C_D_ display.