1. Useable cartridge : HP 950,951/932,933
2. One touch ink recharging, 4 inks recharging at the same time, perfect clean recharging, very low price.
3. How to use: Insert cartridges to recharger - Press the button - The LCD turns 'FULL' when it is done.
If cartridges are identified as defected, insert genuine HP cartridges and let it initialize.