Plus 2 x Key Fobs. The Dahua AirShield wireless security system consists of alarm hubs, various wireless peripherals and several applications for end users, installers and ARCs. It complies with EN50131 Grade 2 standards and is equipped with cutting-edge technologies to ensure the safety, reliability and ease of use of the system. Featuring easy installation, stable connectivity, user-friendly mobile management and other advanced functions, the system provides modern residences and commercial buildings with tangible protection through invisible connection. The main alarm kit comprises of: 1 x 4G Model Hub2 2 x PIR 1 x Magnetic Contact 1 x Internal Siren 1 x External Siren There are two kits to choose from, which in addition to the above either contain 2 x Key fobs or a key pad.. Choice of kit with additions of: 2 x key fobs or 1 x keypad. Airshield HUB2 - supports up to 150 wireless peripherals. Wired, Wi-Fi or GPRS network connection. SOS emergency alarm