Fenix Tactical Weapon Accessory Set for TK15, TK15C, TK22, PD35, UC35: Pressure Switch, Offset Rail Mount and Batteries Specifically designed remote pressure switch with four sensors for tactical flashlights More agile and convenient operation for your tactical mission or hunting. 1''Offset mount with 2 Rubber Inserts for lights with 0.85-1 inch body tube Include two LumenTac CR123A batteries in the package Genuine Fenix Pressure switch (AER-01, original code name AR-102)