?Product InformationProduct Name : BABU 502 T502 Ecotank ink bottleproduct Include : 1 x 127ml Black Refill ink, 1 x 70ml Cyan Refill ink, 1 x 70ml Magenta Refill ink, 1 x 70ml Yellow Refill ink (Total 4 Pack)Page Yield : 7,500 pages per black ink bottle & 6000 pages per color ink bottle @ 5% coverage ( A4 paper )?CharacteristicNew Design to prevent corrosion and printhead clogging, ensuring the best output quality and protect the printhead, which could extend their service time.Made from ISO-9001 and ISO-140001 Certificate Approved factory . made High-Quality Ink Cartridge, Print with excellent color and crisp text.?Please confirm your Printer Model before placing an order.?Printer Compatibility ET-2700 ET-2750 ET-2760 ET-2720 ET-4752 ET-3830 ET-3850 ET-3700 ET-3710 ET-3750 ET-3760 ET-7700 ET-4700 ET-4750 ET-4760 ET-7750 ET-15000ST-2000 ST-3000 ST-4000?Warm Tips1. You can keep the printer power-on if you often use it, as printers will run the printhead cleaning automatically when reset, which will waste ink.2. You can turn off the printer power if the printer isn’t used frequently, Just need to switch on the power weekly, which will protect the printhead from clogging.? You're welcome to contact seller to sent message in amazon firstly if any problems happen. We will respond to your question within 12 hours..?