Telephone Record Adapter for Analog or Digital Cordless and Corded Phones Analog Recording Options: Compatible directly into analog wall jack Compatible between handset and phone using an analog phone Digital Recording Options: Compatible between handset and phone using most digital phones. (Most digital phone allow analog audio to pass between handset and phone) Contents of ECS-DUPR: (1) Telephone recording control box, (1) 7 foot RJ11 phone cable, (1) RJ11 T connector, (1) Coiled handset cord (1) 7 foot 3.5 mm male to male audio cable Scroll to bottom on listing to view USER GUIDE in the TECHNICAL SPECIFICATION's below.