Instruct: Classify a review into positive or negative sentiment.
Query: Too many bad transmitters

I have bought three of these, each time thinking that the last one must have been defective. The pattern is always the same - they work fine for a few weeks and then the signal becomes very erratic. Finally it does not pick up a signal at all. Replacing the battery did not help. I was careful to wash the unit with warm water and soap and rinse well every time I used it (what a pain!) , but it made no difference. I wanted this transmitter because it has a replaceable battery, but that is of no use if the transmitter fails before the battery dies. The T31 transmitter is better than this one and I don't have to wash it every time I use it.