ToBeter Remanufactured Ink Cartridges Replacement for HP 61 61 XL, 2 Pack (1 Black, 1 Color) CC641WN CC644WN Refilled with high quality imported ink, vivid and fluent print effect, equivalent to original products The number of pages to print depends on the inside of cartridges sponge volume size Intelligence reorganization, accurate counting, high compatibility, stable performance Better protection of print head and chip in transit 480 Page Yield per black ink cartridge at 5% coverage (Letter/A4) 330 Page Yield per color ink cartridge at 5% coverage (Letter/A4) ENVY Series: 4500, 4501, 4502, 4503, 4504, 4505, 5530, 5531, 5534 and 5535 DESKJET Series: 1000, 1010, 1050, 1510, 1051, 2050, 1055, 1056, 1510, 1512, 2050, 2510, 2512, 2514, 2540, 2541, 2542, 2547, 2548, 2549, 2543, 2544, 3000, 3050, 3050A, 3051A, 3052A, 3054, 3056A, 3510, 3511, 3512 and 3516 OFFICEJET Series: 2620, 4630, 4632, 4634 and 4635 Its not quality problem. This is because the original company blocked the chip technology, so remanufactured ink cartridges chip can not 100% show correct ink level. Please ignore it and press &#034;OK&#034; button to continue printing, all our ink cartridges are filled with enough ink Step1: Take off the ink cartridge and re-install it. If issue still exist, go ahead. Step2: Clean the ink cartridge chip (contactor points) with rubber or alcohol cotton swab. As shown in Picture 1-2.