This is the ULTIMATE NTC Low Voltage Bundle! All companies involved in low voltage systems work should have this library. It is the most complete technical library for the industry. Just check out the (7) amazing title you receive:

NTC Blue Book - Security System Design & Installation

NTC Yellow Book - CCTV & Video System Design & Installation

NTC Purple Book - Access Control System Design & Installation

NTC Red Book - Fire Alarm Certification Guide

NTC Orange Book - Chuck Notes

NTC Brown Book - Fire Alarm System Design & Installation

NTC Fire Alarm Field Notes