Description Product Reviews Allows the use of two handsets on one telephone. Ideal for telephone marketing training purposes.Black 10 Pack Yes this is designed to plug into the telephone and have two handsets plugged in. This will work even on digital sets as the signal going to the handset is analog. The plug on the cable is 4P4C, some call it RJ9 or RJ22. The wired tail is 4″ long. If you need to purchase only 1 or 2 of these you can get them from Amazon.com Prime with Free 2-day Delivery. 4P4C two jacks x 4P4C plug From jack to plug is 4″ Used for telephone training RoHS Compliant Headset Splitter Y Training Adapter for Employee Phone Sales Training 0 Reviews Hide Reviews Product Reviews