Placing the mouse on the circle allows you to read the description. 

How to Install

Wipe the place to install clean with dry cloth. (The position of mike is preferably 40~50 cm off.)
Peel off the protecting vinyl of the tape attached on the bottom of Hands-Free, and attach it to the place to install. (If the surface is too uneven, the tape may come off, so fix it with screws in fixing holes on the bottom plate.)
Insert cigar jack in DC of Hands-Free. (Check GREEN on power lamp).
Insert the earplug of Hands-Free into the ear jack of the hand-held phone, and the Hands-Free is ready.
 

How to Use

 Press talk button of Hands-Free during talk, and press end button when talk is completed.
 Pushing private talk button cuts off the speaker and talk is transmitted to earphone. (Earphone is sold separately.)
 Adjust the talk volume with volume control.
 When it is necessary to charge the hand-held phone, connect the charging jack and check on the charging lamp. (Charging jack is sold separately.)
 Pressing resend button of Hands-Free connects the call to the number of the last call.
 How to use the micro sensitivity control switch
 - If you cannot hear the other person well, adjust the switch to high.
 - If echo is generated, adjust the switch to low.
If the hand-held phone will not be attached properly, attach enclosed metal plate on the part of battery.
 

Charging lamp condition