Features: brand new and high quality Convert one rj9 4p4c socket to two sockets. RJ9 Phone Training Splitter Adapter for IP Phones The installation is very convenient, and the quality can be greatly guaranteed. For headset or cell phone dispensers, office phones, call center/telephone training; easy to set up, plug and for play. For an outside call, both phones will ring, and you can make an outside call at will; when you need to make a call, you can use either one of the two mobile phones. Made of PVC material, which is durable and reliable. Specifications: Material: PVC Color: Black Interface: rj-9 4P4C (male) rj-9 4P4C ( dual female) Length: Approx. 40 for cm/15.74 inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Extension Cable