Please read my review on the Soundbar 700 for more details, but heres a copy/paste of what I said about this AMAZING sub-woofer:About the sound module. The only thing that bothered me was the seems on them. I ordered a 9M and my daughter wears a 9-9 1/2 in toddler shoes. No directions on how to apply and the packaging could be alot better this was a gift and u cant even tell by looking at it what it is . I have a niece who is the same age as the headset who is married with 2 children, thats how old they are. The FK1+ has a much smoother scroll wheel and also includes a nice product information badge on the bottom; this features important info like model,serial, manufacturer etc. The return was very complicated. Great selection, but there really should be a size comparison photo. This is pretty disconcerting at first, and almost made me lose balance. 5w stride rites.