Product Name:Phone Jack Splitter ; Type: RJ11 6P4C Male-2 Female Socket RJ11 6P4C male TO double 6P4C Female Telephone Adapter Cable. RJ11 Phone Splitter helps to insert two devices such as telephone, fax, modem,answering machine into wall jack.Phone module adapters can also use fax machines as well as phone.The module contains a male header and two female headers.Because all four pins are pins, two lines can be divided into two outputs as needed. Ease of Use: This modular cable is very easy to use.Connect this product to the RJ11 telephone socket and then connect the RJ11 cable (not included) to this product.One end is 6P4C Osplug, and the other end is two 6P4CRJ11 sockets.