Circuit board design 1/4 circuit board design helps ensure more stable and noise voice transmission. Bronze needle construction Bronze needle resists oxidation and enhances conductivity for better transmission stability. This construction contributes to clearer calls and consistent performance. 1to4 telephone line splitter Divides one telephone line into multiple connections, allowing a single line to connect to multiple telephones or modems. Enables lossless transmission across all connected devices, with simultaneous use supported. Voice expansion made simple Addresses the limitation of voice expansion wiring that relies on a single RJ11 port. Distributes the line without needing additional devices for multiple connections. Compatibility and practical use Compatible with standard RJ11 telephone lines and interfaces. Ideal for small offices, home offices, and scenarios where a single line must serve several telephones or modems. Use scenarios Small office setup: share one landline among multiple desk phones and a modem or fax machine. Home office: connect a landline to a computer modem and a house phone for concurrent use. Temporary or shared spaces: distribute one line to several handsets in a conference area or multipoint workspace without signal loss.