Not sure, why it says it has 60 serving of 10 breaths each. Cause I had puffed about 150 breaths when the battery died. This happened and 2 separate occasions. The first time I reached out to them and they sent a replacement, and the same thing happend again. I dont think its worth the $20 bucks per unit. Helo Melo charges $17 per unit and I got near 800 puffs over 2-3 weeks. Did I get a bad batch or something??