This is the Scuba Diving Computer Battery Changing Chuck Key Aeris, Oceanic for ATMOS elite (receiver), XR-1, XR-2, ATMOS 2, and ATMOS 1 Features: Perfect fit for changing out batteries on ATMOS elite (receiver), XR-1, XR-2, ATMOS 2, and ATMOS 1 Dive Computers A must-have tool for your Save-a-Dive kit! Don&';t let a dead battery stand in your way to a great day of diving.