The Milwaukee M18 ONEIWF38 ONE-KEY 3/8in Friction Ring Impact Wrench connects via Bluetooth with the Milwaukee ONE-KEY app. Allows for complete tool customisation, allowing you to tune the tool to your needs. Configure to any application choosing optimum tool settings for repeatable precision. Save up to 4 custom settings to the tools memory for fast selection on the jobsite. Select from a range of application profiles or quickly create your own for perfect results on every trigger pull. ONE-KEY app also provides inventory function for total management of your complete tool/equipment fleet. Offers 4 modes of operation thanks to it’s unique Milwaukee DRIVE CONTROL, which allows the user to shift into four different speed and torque settings to maximise application versatility. The 4 modes are: -Mode 1: For precision work.-Mode 2: Helps prevent damage to fasteners and material.-Mode 3: Delivers maximum performance for the toughest applications.-Mode 4: Intelligently detects when the tool has impacted on a fastener for one second automatically shutting the tool down, reducing overdriving and damaging materials. Mode 4: No Load Speed: 0-2,000/min, Impact Rate: 0-2,600, Torque: 0-120Nm. M18 ONEIWF38-502X: 2 x 18 Volt 5.0Ah Li-Ion Batteries.M18 ONEIWF38-0: Bare Unit, No Battery or Charger. Specification Bit Holder: 3/8in Friction Ring.No Load Speed: 0-1,700/0-2,000/0-2,500/min. Impact Rate: 0-2,400/0-2,600/0-3,100/bpm. Torque: 40/120/300Nm.The Milwaukee M18 ONEIWF38-0 Fuel ONE-KEY 3/8in Friction Ring Impact Wrench is supplied as a bare unit, NO battery or charger supplied.