Total Trim Pro Cordless Hair Trimmer Machine is very easy to use. The installation guide for different heads over the trimmer is provided along with the trimmer. There also is a battery charger that comes along with the product. It gives a battery backup of around 4 hrs at a full charge which is enough to last 15 days for the males to use.TotalTrim Pro Multi-Functional Hair Trimmer comes with a complete manufacture warranty of one year. There is a stamped warranty card that comes in the product box and people can register for a warranty at the official site of the product.Visit Here