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alarm security system
Ionization type sensors are best at detecting fast burning fires, while photoelectric sensors are generally better at alerting you about smouldering, or slow burning fires. You should have both types of alarms in your house. Smoke alarms such as the Nest Protect are designed to pick up both types of fires. Carbon monoxide and other gas detection. Even if you don't have a fire in your home, you can be suffocated by carbon monoxide. A good detector should also protect you against this.san francisco security companies
The wires are tucked inside the camera’s covering. Its lens is covered with a thick layer of protective polycarbonate plastic or glass. The protective plastic or glass encloses the camera to prevent people from breaking it. The camera may be weatherproof so that it can be used for outdoors. Pinhole Security CameraThe pinhole security camera has a very small lens. It may be powered by batteries or a DC power supply.