Definition: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Input: I use this phone holder every day on my commute, in conjunction with an auto charger and hands-free earset. I find it indispensable in securely fastening the phone in place, yet easily removable. It makes one-hand dialing easy, and I don't have to worry about the phone sliding around because of sudden turns or stops. One word of note: it doesn't accept the use of oversize extended-life batteries.
Output:
Positive