Promate proHarmony.2 User Manual page 7

Talk and finish calls
When a calls comes, you Can Hear the alarm sound "dee,dee..", The
proHarmony.2 red light goes on.
A. The smartphone ringing→press shortly the Sf key or press the receiver key
on smartphone → red light flashes quickly(around 2 times/second).
B. Call: Go to the smartphone, and then press the Sf key to answer the call.
(Some phones may not support this feature, the call forwarding cannot be
completed.)
C. If you want to refuse the call, you can press S1 once shortly.
D. During talking, press S5 key, volume + press S6 key, volume -. from low to
high total 15 levels,you can hear "Bee ,Bee"when on low or on high)
E. Press S4 key shortly, Off key on mobile or the order side hang up the call to
finish calls → red light flashes slowly(around 1 time/second). After that, if
stereo is connected → red & blue lights flash slowly → stereo mode has been
entered automatically
Smartphone Stereo Music Play Mode
Your proHarmony.2 play music from your smartphone through Bluetooth™
stereo system.
a While playing music, press S3 key quickly to go Backward.
b While Playing music, press S2 key quickly to go Forward.
c While Playing music, press S1 PLAY key quickly to stop the music. Press S1
PLAY key quickly to start the music.
Note Base on different settings for different smartphones, during the headset's
stand-by mode,the Bluetooth™ connection may be automatically cut off.