18V EC Brushless Connected-Ready 4 1/2" Angle Grinder Bare Tool combines legendary Bosch grinder performance with connected-ready capability. Its efficient EC Brushless motor delivers greater runtime and it has the capacity to transfer up to 35% more power and up to 110% more runtime with an optional CORE18 V battery (sold separately). Add advanced operational electronics, and the tool provides the best cordless grinding and metal-cutting experience available. When coupled with an optional Bosch GCY30-4 Bluetooth connectivity module, the connected-ready grinder supplies next-gen user control, using the free Bosch Toolbox app on a mobile phone.