1. Total of 6 function keys: POWER-EN, PLAY, VOL+, VOL-, PREV, NEXT.
The key function is introduced as follows:
POWER-EN: the switch control module when the switch, the toggle switch,
when the POWER-EN is connected toBAT, module startup;
When POWER-EN disconnect BAT, module shutdown, usually used when battery power.
Adopting the module electrically powered, only the 10K POWER-EN series resistor connected to BAT,
can realize the module electrically powered, usually used in the external power supply.
PLAY: play / pause (short press), with the hang up (by a long, time slightly longer), re pairing (long press)
VOL+: volume plus
VOL-: the volume reduction
PREV: a
NEXT: the next song


2. LED: the match state, double flashing alternately, paired, single lamp flicker;
3. USB card function (for USB sound card function please specify);
4. AUX-IN switching function;
5. 3.2V low battery alarm, automatic shutdown (3.0V, the realization of the AMS1117 power supply);
6. the maximum charge current is set to 250MA, full of the light out,
lit another lamp (personal recommendations with charging module, fast);
7. no connection has been in a match;
8. can also connect the 2 Mobile phone;
9. EN audio amplifier control pin, when in the silent, after a period of time, the output low;
when playing, the output high level (1.8V).