Specifications :
Model Number: KM20
Bluetooth Version: V3.0 + EDR
Frequency: 20 h ~ 20 KHZ
Sensitivity: -42 db+ / 3 db 360
Output Voltage: 5 v + / -0.5
Output Current : 2.1A
Working Current: 45mA (Max)
Stand-by Current: 25mA (Max)
Frequency: 2.402 ~ 2.480 ghz
Effective Range: 5 meters
Sensitivity: -92 dBm
RF Output: 4 dBm

Frequencies:
FM:87.5MHz - 108.0MHZ
Transmitted Power:
87 dBuv / 107 dBuv
Effective Range: 2 meters
Net Weight : 80g
Gross Weight :185G
Package Size : 16.5*12.5*5 cm
Feature :

Multi-Playing Modes
A: Via Bluetooth; B: Via Micro SD/TF card (MP3, WMA, WAV format supported); C: Via USB flash disk; D: Aux input and output Via 3.5mm Audio cable (MP3 player, tablet, etc.), Short press the Mode button to switch the playing modes

Crystal Sound and Hands-free Calls
A built-in microphone with enhanced voice detection makes hands-free calls easy - plug-in, sync your phone, and you’re ready to talk!

Big LCD Display:
1.44 inches screen provides clear display: song name in TF card or USB Disk, incoming phone number and voltage of the car battery.

Faster Charging :
Comes with a 5V-2.1A charging port which can charge most USB devices, better charging performance!

Three Song Playing Modes and Reading TF/USB Disk folders
It supports Normal, Repeat and Shuffle Playing Modes while playing songs in USB disk or TF card , also can read its folders.

Power on/off Manually
Long Press 5 seconds phone button to turn on or turn off, humanity operation and easy operate.

User Tips
All functions keys are designed for Bluetooth Mode, if you connect through Aux-in using audio cable , you will have to operate on your phone to adjust volume , change songs or answer phone calls
Please check if both the car radio and transmitter are on the SAME station. If not, please set both of them on the same station to avoid noise .
To achieve best audio quality, please set the volume on your phone to maximum and then adjust the volume for your car stereo; you are not suggested to adjust volume of your car speaker to maximum (this will bring lot noise).
If there is no sound when you make a phone call, you can try to turn up the voice call volume on your cell phone and volume of the transmitter.
Please only use Micro SD card in FAT format up to 32G memory ; it only supports music in MP3 WMA and WMV formats