This company trimmer is not good for use . It is not user friendly . if pay a little more than you can buy a trimmer of Phillips and Panasonic which is better than of this . it does not hair perfectly . This trimmer is not effective when you using it it can off automatically any time. It battery backup is very bad each trimmer of nova is very bad . Trimmer of nova is get bad stuff.so I give suggestion to all of you dont buy nova trimmer at all.