Wireless Vibration/sound Sensor Door Light
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The Wireless Vibration/ Sound Sensor Door Light is a flashing light signal designed for use by individuals who are deaf or hard of hearing. The unit is designed to be hung on a doorknob, and when someone knocks on the door or turns the doorknob, the unit lights in response. This unit may also be used with either a telephone or an alarm clock. POWER: Uses three double-A batteries (not included).