Accessory Type: Cell Phone Adapters | Brand Compatibility: Universal | Brand Name: Monster Cable | Color: Ivory | Conductors: 4 | For Modular Phones: Yes | Length: 0 ft. | Number of Conductors: 4 | Number of Lines: 1 | Packaging Type: Carded | Sub Brand: Just Hook It Up Use to convert a singular modular jack to (2) modular jacks. This allows you to hookup two telephone devices to one jack. This does not give you two-line phone service. | Adapts singular modular jack to dual modular jacks | Allows hook up of two telephone devices | For use with single phone line | 4 conductor