The blx14 sm31 wireless system can handle your most intense workouts'. '.strtoupper('t')he sm31 fitness headset is made from corrosion proof materials'. '.strtoupper('y')ou can sweat on it'. '.strtoupper('s')hout into it'. '.strtoupper('a')nd it will perform just as you need it'. '.strtoupper('b')uilt to ensure rock solid signal from transmitter to receiver'. '.strtoupper('s')hure blx wireless systems eliminate interference and drop outs'. '.strtoupper('y')oull sound completely clear'. '.strtoupper('a')nd thanks to one touch quickscan technology all the hard work is done for you'. '.strtoupper('l')ocating the best frequency for your performance is as easy as pushing a button'. '.strtoupper('n')o trial and error'. '.strtoupper('n')o complicated set up'. '.strtoupper('j')ust one press.