1. Modern security door alarm systems use advanced sensors such as infrared and magnetic contact to detect intruders immediately. High-quality systems can also provide multiple layers of protection by combining with video surveillance.2. Wireless systems can be installed without drilling using adhesives and are compatible with smart home platforms like Alexa or Google Home.3. If someone tries to break in, a deafening alarm (up to 125 decibels) will sound, and a warning message will be sent to the owner via an app, text message or phone call. 4. The battery can work for a long time (up to 2 years) and has a low battery warning function. High-quality models have emergency power options provided by solar panels or power adapters.5. Precise sensor technology for instant alarm activation and maximum theft protection, including IP65 rating for protection against weather.