This DIY wireless security system is easy to install and ready to use. It is a 4-zone system (monitor up to 30 sensors/accessories) is designed for houses up to 3000 sq. ft., plus apartments, condos, offices and businesses. Uses rolling code technology for maximum security and fewer false alarms. Emits a piercing 110dB siren. Up to 100ft. range. Lighted keypad with chime, instant and delay modes. Low battery indicator. Can be customized to fit individual needs.