Hours Of Operations TSR Alarm Maryland Rockville 20852 TSR Alarm Hours of Operation and Location in Rockville, MD 20852 4.1 - 38 votes 11601 Landsdown St, Rockville, MD 20852 (301) 230-1277 Get Directions TSR Alarm Hours Category: Electronics Hours Hours may vary due to season or holiday reasons. For specific hours, please contact store directly. Map Explore RockvilleView More Apparel MarshallsTJ MaxxRoss Dress for LessH & MCarter's Sports TargetSports AuthorityLA FitnessColemanBlades Jewelry MarshallsChico'sAvonJ JillJared Recommend For You Tsr Incorporated Webs Webs Webs LLC A & P Food Store A Dollar American Building Arc Bargain Store Basic Basic Basket Shop Blades