How to make Door Alarm at home - NO ROPE CLIP WIRE SCREW - Simple Easy & Smallest Ever - Homemade

Building the air raid siren

How to Make a Speaker at Home - Using DC Motor

How to Make a Simple Door Alarm

Car Horn Rigged Alarmclock!

75V generator , Free energy , new project 2018

How to make a TRIP-WIRE ALARM

How to Make a Speaker at Home - Using Plastic Bottle