1. This Is A Pulse Signal To Audio Signal Converter Specially Designed For Old Dial-Type Telephones. Through This Converter, Your Old Telephone Can Convert The Pulse Signal Into A Dual Tone Multi-Frequency (DTMF) Signal. The Number Dialed By Your Telephone Can Be Recognized By Modern Switches And Dialed. 2. In This Way, Your Favorite Phone Is Not Just A Decoration, But The Old Telephone Set From Decades Ago Can Be Used In . 3. For Cities Or Areas That No Longer Support The Pulse Dialing Signal Of Old-Fashioned Dial Telephones, It Is Especially Suitable For Users Of The Internet Or Optical Fiber To The Home. 4. The Enhanced Version Can Be Used On Standard Local Telephone Lines And Fiber Optic Or Network Adapter Lines As Well As Personal Switch Lines. Numbers Can Be Dialed. Facilitates Automated Voice Communications. There Is A "Redial" Function. 5. Easy To Install And Use, No Need To Dismantle Or Modify The Phone. Just Connect The 2 Wires Of The Telephone To The Designated Terminals, Plug In The Crystal Plug Of The Telephone Line, And You Are Ready To Use; 1. Power Management: Power Management Is Not Supported 2. Type: Switch/Distributor 3. Remote : Remote Is Not Supported Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:Plastic Package Contents: 1x Converter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.