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Use in closed-circuit alarm systems Detects shock to window glass, walls, or ceilings Pure silver contact with gold plating assures reliable, long-term operation Built-in tamper switch for complete security Contact pressure: Adjustable from 1 to 50 grams, recommended setting between 5 and 25 grams Contact rating: 1.0A at 50VDC Life: Over 100,000 contacts Size: 5/8"x7/8"x23/8" (15x21x60 mm)