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TECHKO S184 VIBRATION ACTIVATED SECURITY DOOR ALARM AND DOOR CHIME. FEATURES: VIBRATION ACTIVATED SECURITY DOOR ALARM AND DOOR CHIME Vibration sensor detects attempted entries through protected doors and sounds a piercing 105dB siren for a selectable 5 to 15 seconds Option alarm or door chime No installation required - simply hang on the inside door knob 9 volt battery operation Battery low indicator 3 year warranty Chime mode is provided to alert you when the door is opened or closed, an added safety feature for children and others
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