There are only a few options when looking at amplifying volume of an AAC app used on an iPad. One of the best options now available is selecting an iPad Pro model versus a standard iPad model. It has 4 speakers instead of 2 and is considerably louder. Of course, in many situations, we have to work with what the student has (often a standard model iPad), so in that case, we are looking at speaker amplification. That can be accomplished by 1) purchasing a case that includes amplification - generally either the AMDI iAdapter or the ChatWrap (both of which are pricey - ChatWrap $395 iAdapter $285) or 2) pairing the iPad with a separate bluetooth speaker. When pairing with a separate off the shelf speaker, you need to be cognizant of running time on a single charge. Most die within 4 hours. Many people have gone with the iON Clipster in the past, which has decent sound, decent battery life, is lightweight and has a carabiner that can be attached to the handle or strap on a device. It seems that iON Clipster is no longer being manufactured, however, so prices have jumped from around $25 to closer to $50. Another thought is that if amplification is only needed in certain environments like the lunchroom, a tabletop speaker could be brought to that environment and simply placed nearby on the table or floor. Those are easy to research on Amazon. You'd just want to look at rating, battery life, and size. Read comments to be sure that the speaker doesn't have a delay. Some bluetooth speakers have a delay, which causes the beginning of each spoken message to be truncated (first word or two is lost).