The 2-in-1 Alert and Alarm System puts you in control. It is a simple and cost effective solution to protect your family when you're at home or to secure your home when you are away. Thanks to do-it yourself wireless installation, no wiring is needed, it can be set up in minutes and there are no monthly fees or contracts. First it functions as an external siren for the SkyLinkNet Alarm System. When the SkyLinkNet Alarm is triggered, this M-Series Main Unit will sound as well as an external siren. Secondly, you can use this M-Series as an alarm system with 2 operating modes: Alert Mode - Safety and Peace of Mind when you're home. Get notified of your surroundings. Place your sensors indoor and outdoor and get notified if strangers are around your home or if a door, window or garage door is opened. The alarm system will beep and flash the zone light when a sensor is triggered in the alert mode. Alarm Mode - Security when you're away. Protect your home when you're away and sound the siren (built-in to the main unit) when sensor is activated. Arm your system with the keypad or keychain remote. If an intruder tries to break in, the sensor will be triggered and a loud siren will sound. Color: White.