From the first name in coffee brewing comes the first coffee grinders of the 21st century! The Digital InterLock Series from Curtis, with ADSTM (Advanced Digital System) technology. These coffee grinders enable users to link grinder to brewer for the perfect brew, every time. Specially designed and styled for use with Gemini® and ThermoProTM Series brewers with 3-Batch option, these advanced grinders interlock for complimentary systems, making fresh grind/fresh brew programs a snap. And Dual Hopper capacity gives you the flexibility to fresh grind from two separate selections, making your specialty or decaf coffee as fresh as your house blend.