1. Chips are used for printer PCB, not for the toner.
2. You needn't reset chip, so it is not one time chips, it can be used for ever.
3. We have chips for Samsung 1640, 2240 and samsung 310/315.
4. The chips are all tested out and sold well in the market by now.
5. If the chips can't work you can send back them to us.
6. Our chips without version difference, they can be used any where.
7. Chips can work without change chips then, and after our chips used you can make samsung 1610 toner cartridge replaced samsung 1640. So it means permenant chips.