High power, ultra-fast charging lithium-ion battery is ready to use in less than 5 minutes | Fully charged in around 2 hours, which will provide approximately 90 minutes of operation | Use any USB 5v DC power source, but 2100mAh recommended | Fully adjustable & lockable with 40 different settings to choose from: 0.5mm to 20mm in 0.5mm intervals | Integrated LCD display shows the percentage of battery remaining before charge | 32mm wide high carbon stainless steel blades are perfectly designed for optimum maneuverability, comfort & precision | This professional trimmer comes with a USB Charging cable only