Bose’s upcoming Sleepbuds can play only the 10 relaxing sounds that are loaded in the buds themselves, and can mask out other sounds. A mobile app will let you pick the sound, adjust the volume and set an alarm. They will come with soft eartips and a charging case.
A DIY Bluetooth speaker kit for newbies of all ages. The kit and its iOS app teaches how magnets can turn electricity into sound and the basics of frequency and waveforms. There are far cheaper ways to learn all that, but to also get a BOSE speaker for $149 is a great deal.