Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: heart rate monitor

Bought this to replace non coded transmitter that stopped working after 2 years. Belt is more comfortable but after wearing the transmitter 35 min. it stops working and needs to be dried off. This is always in the middle of my workouts. I haven't even worn it in the pool, not sure if it will even detect my heart rate if its submerged. Would not buy this product again.