Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good unit at a good price

I purchased this item to replace the same one I had for three years because I thought it broke. Turned out it was fine so I'm keeping the new one as a spare.I've been very happy the performance of this unit. The sound quality is good and the price is by far the least expensive of all the driver to passenger communication systems I found. It's full duplex. It fits easily inside a 3/4 helmet. Up to about 55mph the volume is fine, after that it can be hard to hear. For the price I can live with that. Riding about 4 hours per week the batteries last at least 6 monthsI have never tried any other system so I have nothing to compare this one to but I'm very happy with this unit.