Pin

Name

Function

in/out

1

In DC

DC in for battery charging

in/out

2

DATA IN

Data received

in

3

GND

Ground digital

4

DATA OUT

Data sent

out

5

+ 5 Volt

+5V output Limited

out

6

Test

Switch phone off and provide +5V.

Test

7

MUTE

Mute 0-Normal, 1-In Call

8

Internal/external

Portable handsfree In

9

GND

Ground Analog

10

Accessory

Related to Mic/Speak

11

BF in

BF input

in

12

BF out

BF output

out