The new ULTIMATE PRO Back Shaver's unique patented design will enable you to reach all areas of your back by yourself with ease and shave off all your back hair effortlessly, plus added Power Burst button to shave through extra thick and coarse hair. battery life is estimated 3-4 years.Charging time from depleted to full charge is 6-8 hours, but initial charge can be from 8-12 hours 2 Interchangeable Attachment Shaving Heads - 1.8 inch ultra wide back groomer blade to shave large areas and longer hairs quickly, plus an additional foil body groomer bi-directional head for regular maintenance, shorter hairs and a perfectly smooth shave Shock Absorber Multi-Functional Flex Necks on both Attachment Heads effortlessly follows the contours of your back for perfect blade to skin contact at any angle, resulting in the ultimate shave in both comfort and closeness Extreme Reach Extendable Ergonomic Rubberized Handle locks into place at any length you choose with the new PRO XL Extensi