Free switching between two modes
Two mode of Sonata HD II can be selected, either “Call mode” or "Pure music mode".
When connected with a pair of earphones WITH Microphone, it is under the “Call mode”, you can answer phone call through Sonata HD II. if use a pair of earphones WITHOUT Microphone, it enters the “Pure music mode”.
Tip: Please plug your earphones into Sonata HD II first, then put them together into your mobile phone or computer.
No need to change firmware when you want to switch between “Call mode” and “Pure music mode” , just use different earphones.