2pcs T6715 6715 Maintenance Box Chip For WF-4720 WF-4730 WF-4734 WF-4740 EC-4020 EC-4030 EC-4040 Printer Waste Ink Tank The T6715 maintenance box chip is designed for use with select printer models including WF-4720, WF-4730, WF-4734, WF-4740, EC-4020, EC-4030, EC-4040, WF-4745, WF-4820, WF-4830, and WF-3820.It works specifically with the 4730 maintenance cartridge to support proper waste ink management in compatible devices.This one-time use chip performance during the life of the maintenance box.Once installed, it cannot be reset.The chip features a plug and play design for straightforward installation, allowing integration into the printer's system without additional configuration.By enabling timely replacement of the waste ink tank, the T6715 chip helps maintain consistent printer.It supports efficient maintenance routines and contributes to reduced material waste through proper ink system management.Suitable for both home and office environments, this chip provides functional compatibility across multiple printer models for ongoing printing needs.