Remington’s Lithium Power Series R4 Rotary Shaver features Power Flex 360 degree Technology which allows the entire head to adjust to any angle on the face to help reduce irritation. Its Precision Cut shaving heads with Twin Track 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.