Model: 509<br>Material: resin<br>Color: gold tone + black + print<br><br>Main functions:<br>FSK and DTMF caller ID display， auto detection<br>Check number / time of phone numbers dialed<br>Incoming call number check， quick check， redial， electric calendar，date， time and week display， handsfree， anti-thunder function， IPfunction， P/T function， electronic bell ( ding-ding )， blue screenbacklight ( no need to install battery )， single key redial<br>Key function:<br>Handsfree ( HF )<br>Redial ( RD )<br>Setting ( SET )<br>Up check ( UP )<br>Down check ( DOW)<br>Call out ( OUT )<br><br>Instructions:<br>a. It cannot be used as an extension telephone.<br>b. Connect one end of the telephone line to the signal jack and theother end to the LINE jack of telephone. Then connect one end ofthe handset to the HANDSET jack of telephone.<br>c. It shows a caller's telephone number only when user has appliedfor caller ID display service.<br>As for more details， please take the user manual for reference!