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Amazon.com : Portable Wireless Touch Door Sensor Anti Theft Security Alarm Loud Door Knob Touch Alarm for Door Handle 120dB Ultra Loud Alarm Ringing : Electronics
Latching Touch Sensitive Alarm Electronic Circuit - Hackster.io
Amazon.com : Door Handle Alarm, Wireless Home Security Touch Door Sensor 120db Anti Theft Security Alarm Loud Door Knob for Home/Office/Shop/Bank : Electronics
Latching Touch Sensitive Alarm Circuit Using 555 Timer IC
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