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