Welcome to our shop.Have a nice day. This product is a set of permanent ink level display cartridge chips designed for use with compatible WorkForce and WorkForce Pro printers.It is compatible with the following printer models: WF-3620, WF-3640, WF-7110, WF-7210, WF-7610, WF-7620, WF-7710, WF-7715, and WF-7720. The set includes four CISS auto-reset chips — one each for black (BK), cyan (C), magenta (M), and yellow (Y) — pre-configured for either European or American market cartridges: - Option “Europe-T2711-T2714”: Includes 1 set of T2711–T2714 CISS ARC chips, compatible with T2701–T2704 and T2711–T2714 cartridges used in European-market printers. - Option “America-T2521-T2524”: Includes 1 set of T2521–T2524 CISS ARC chips, compatible with T2521–T2524 cartridges used in U.S.-market printers. The chips are intended for use with refillable ink cartridges in continuous ink supply system (CISS) configurations.They restore ink level reporting functionality when installed on compatible cartridges. Before ordering, please verify your printer region and corresponding cartridge model number (T252x series for North America, T271x series for Europe) to compatibility.