This line splitter divides telephone lines into 3 separate outlets L1, L2, and L1 + L2.
You can plug up to three modular devices into one jack (phone, fax, modem, etc.) The first jack will only respond to Line 1, the second to Line 2, and the third jack can use either Line1 or Line2.
* White color
RJ11 6P4C Line Splitter, Line1/Line2/Line1+Line2