Brand Name: Monster | Color: WHITE | For Modular Phones: Yes | Number in Package: 1 pk | Number of Conductors: 4 | Packaging Type: Carded | Sub Brand: Just Hook It Up Speaker Phone, Fax, Etc. Answering Machine. Jack to Accept 2 Modular. Easily Adds A Telephone at a Phones or Phone and an Accessory. | Adapts singular modular jack to dual modular jacks | Allows hook up of two telephone devices | For use with single phone line