PRODUCT DESCRIPTION The Braun Series 7 790cc-4 electric foil shavers have the worlds only intelligent Sonic technology that automatically increases power in difficult areas. Powered by a lithium ion battery, the Braun Series 7 790cc electric shaver is the smart choice for the discerning man. Significantly gentler and more efficient than any rotary shaver, the Series 7 electric razor contours to the curves of your face with flexible blades on a fully pivoting head for maximum coverage. This electric shaver also adapts to your beard density, using up to 10,000 micro vibrations per minute when needed. With less strokes and pressure required while shaving, the results are smooth skin without the skin irritation. And as the Series 7 electric razors shave as close as 0.05mm, as thin as half a human hair, that smoothness lasts longer, for a highly efficient and superior shave. The electric shaver also comes with a Clean&Charge station, the world's only 5- action alcohol-based system that hygiencially cleans, charges, and lubricates the blades and shaver. Engineered, tested and made in Germany, you are guaranteed exceptional performance every day, for up to 7 years. The best environmental temperature for charging is between 41 degree Fahrenheit to 95 degree Fahrenheit / 5 degree Celsius to 35 degree Celsius. Do not expose the shaver to temperatures higher than 122 degree Fahrenheit / 50 degree Celsius for extended periods of time. MANUFACTURER CONTACT INFORMATION Monday Friday (8AM 4:30PM) (800) BRAUN-11 for more details on usage or refer to the website for usage instructions to help address any existing issues.