· Compatible With: SIMOLIO model SM-823D Pro headset purchased after November 12, 2024; SM-824D1 headset purchased after November 9, 2024; SM-824D2 purchased after October 26, 2024. · Not Compatible With: SIMOLIO model SM-823D Pro headset purchased before November 12, 2024; SM-824D1 headset purchased before November 9, 2024; SM-824D2 purchased before October 26, 2024, SIMOLIO model SM-8245 and SM-8245D. · If you are not sure if this is compatible with our current system, or if you want to purchase additional replacement headser receiver that is compatible with your current SIMOLIO headphones, write to SIMOLIO support for a quick and confirmed answer. · Headset ONLY, NO Charger Included. Battery Included.