Works perfectly for its intended purpose - easy to use, quickly inflates my Intex twin size mattress, and not too loud (not quiet by any means, but it sounds pretty normal to me for a pump). It takes 4 "D" size batteries and I never had to replace these for at least the first dozen uses (inflating the mattress). However, be sure to remove the batteries in between uses or you'll wind up with battery corrosion like I did, hence why I'm ordering a replacement. I just kept the box the mattress came in and stored the pump and the batteries separately inside the box. I would highly recommend this product due to durability, ease of use, and a great price.