The DeWalt 20V MAX 2.0 Amp and 4.0 Amp Li-ion Batteries, Nos. DCB203BT and DCB204BT, have Bluetooth capability. The batteries pair with Apple and Android smart devices via the free Tool Connect Mobile App, allowing users to control batteries remotely. Users can view inventory, turn batteries on or off at once, monitor charge level, view Bluetooth signal strength and pair additional batteries. The app home screen shows individual battery's diagnostics and settings. This app allows equipment to be shut down to conserve battery life and deter theft. Users also can receive important alerts generated for the app and compatible batteries.