Wrist phones

[allover]

Recently on site, my electrician had a $600 Apple wrist watch on, what caught my attention was he could answer the phone and continue working as he talked. I know that you can get blue tooth devices to do this but i walk on site place the mobile (Android) some where as i find it an annoyance to carry on me plus having to answer it with all types of crap on my hands or in the middle of doing some thing
Have scouted the internet but all i see are are mini computers with more crap than you can handle, all i want is a simple good phone that is loud (industrial deafness), even if i have to connect to my mobile via blue tooth
Has any one experience or recommendations for an affordable phone?