GBU Taiwan launches a series of digital wireless surveillance systems by deploying 802.11a/b/g technologies. Working perfectly with existing wired CCTV systems and making them wireless and less interference. Designed for outdoor and long range security application. GBU products, guaranteed best utilities!! Products features: 1. Long range up to 20km 2. Easy to install 3. Digital system, avoid interference 4. IP68 approval for outdoor use 5. Multi channels