digoo wireless home and business security I review Refer ► Buy on Amazon → https://goo.gl/D1ocJ9 The Digoo DG-HOSA is a very fine home and small business alarm system. It is intended to be installed by the DIY'er and comes with quite an extensive installation manual. It is based on wireless sensors which send their status to a central control panel, all without any wires. The basic system comes with two door/window magnetic sensors and a passive infrared motion sensor, as well as two keychain remotes. It is designed to support up to 99 devices (smoke detectors, additional door/window sensors, additional motion sensors, external siren, etc). Door sensors are installed using double-sided adhesive, no holes in the wall. With the unit paired to your home WIFI, and the installation of the Android software on your phone, it will communicate with your Android phone, sending slerts with every change in alarm status, as well as allowing you to fully operate your alarm system from your phone. I found that this is my preferable way to operate the alarm. With the addition of a SIM card, the unit can send SMS messages and / or audible phone messages to as many as five outside phones. This would allow you to notify friends/family of an alarm. Please note: unlike the majority of alarm systems, this system does not require a "central monitoring station" and, thereore, there is no monthly fee for usage. The only cable necessary is a USB cable, used to power and charge the base unit. The base unit itself has a built-in rechargeable standby battery, for use during power failure. However, it is necessary to keep it plugged into 5v USB power during normal operation. Door/window sensors use the readily available CR2032 3 volt button batteries (the same ones that my car remote uses). I do not know what battery the motion sensor uses. I think this is the ideal alarm solution for renters, as you can take the system with you when you move. With the addition of extra sensors, it would be the basis for a good security system for home or small business as well. I am impressed!