Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
Does exactly what it should. I use it with a Blue Tooth receiver to work as wireless headphones with a set of ear buds. No noise on changing volume levels, long lasting (wear at night, so subject to toss and turn). The variable resistor must be of some quality in that it hasn't started making noise yet. (most cheap volume controls (potentiometers), start making noise after a short while).

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive