My Fitness Remington R4 Lithium Power Series Rotary Shaver. The Remington Lithium Power Series R4 Rotary Shaver features PowerFlex 360 Technology which allows the entire head to adjust to any angle on the face to help reduce irritation. Its PrecisionCut shaving heads with TwinTrack blades smoothly cut long hair and stubble for an ultra close and comfortable shave every time. The lithium power drives high energy and torque to deliver 45 minutes of cordless shaving. And when you're finished, it washes clean right under the faucet. High Performance Lithium battery. PowerFlex 360. ActiveContour. PrecisionCut Heads. TwinTrack Blades. Washable Design. Pop-up Detail Trimmer. 45 Minute Runtime. Charging indicator. 6' adapter. Silver/Black.