Original Sony RM-AAU113 Home Theater System Remote Control for Models: HT-CT550, HT-CT550W, STR-CT550, STR-CT550WT Long Lifespan 150 Days Warranty SONY AV SYSTEM REMOTE CONTROL Compatible Models: HT-CT550, HT-CT550W, STR-CT550, STR-CT550WT RM-AAU113 Batteries not included.