From the Manufacturer: Byte Brothers tools exhibit 3 qualities: Innovation- It moves our company and our customers forward. Top quality- work requires tools that repeatedly perform. Affordable- Tools are useless unless you can afford to buy them. Byte Brothers guarantees these 3 qualities plus offers US based customer support, training and quick upgrade and warranty service. Whether you are in the catacomb, telecom, audio/video. electrical or security field, you will find Byte Brothers products designed for you at a price you can afford. Product Description: The Low Voltage Pro uses the latest, award winning, web upgradeable technology to give you the most powerful range of cable and device testing available. With 14 test Apps spread across three models, you can start with what you need and upgrade (via the web) as your needs grow. The Low Voltage Pro Model 3SR is and especially packaged Model 3 that adds 8 Smart Remotes to the kit. Smart Remotes let you test and ID up to 8 RJ45 outlets at the same time. The Model 3 LVPro is the fully loaded, top on the line of the Low Voltage family: The list of capabilities includes cable tests for all wire types (CAT5/6, Coax, Speaker/Alarm, Phone) and 14 Device APPs described below. Tests all wire types measuring delay, skew and impedance and length. Wide ranging tests for all cable types: 12 Device APPs for toning, speaker popping and ID, wall jack ID (RJ45 and coax), port blinking, network 10/100/1000, phone volts, CCTV signal, battery load and printer results. Lots of tools for layout and troubleshooting including and 8 pack of RJ45 Smart Remotes. Huge screen displays all tests at once. Easiest tester to operate. No hidden menus. Auto-off battery saver. Longer lasting battery. Add more test APPs when required.