The GTH head is a Multi Transponder Head that contains No Battery, no circuit board instead using a glass transponder. This head fits existing Ilco Modular System Key Blades, and allows cloning of both TI and Phillips Crypto keys. This can also be pre-coded to emulate 14 different transponders using the TRP Setting Program from Ilco. The GTH head is compatible with the RW4 Plus, Ilco EZ®-Clone Plus and Plus Box units. A simple, free software update is necessary to clone using the GTH heads