It has an integral dust cover, fits 2.54mm (0.1in.) matrix directly, and may be adjusted by a screwdriver from either side. Linear track only. Tolerance: ±20%. Power rating: 0.2W at 70 C. Max volt: 100Vdc or AC. Temperature coefficient: ±250ppm/ C. Dimensions 7.8mm diameter, stands 7.8mm high from PCB. Value is marked on case as shown in brackets.