I believe the Insignia NS-HD01A & the Insignia NS-HD01 as well as NS-HD02 are portable armband units. These first two are the same. The difference between these two & the Insignia NS-HD02 is that it has pictures of artists & albums unlike just a digital display or just a tuner. I hope this was helpful for you. I have both of them. I like the Insignia NS-HD01A because the battery lasts 14 hours & the newer NS-HD02 lasts 8 hours.