The Hosmart Advantage: 30 + years of wireless intercom home system technology produced by our leading factory.Pass Safety Certification and Lifetime Quality Warranty: The wireless intercom system passed FCC, CE, ROSH Certified. In order to insure your benefit, we will give you a lifetime quality warranty. Long Range and Multi-Channel: 2017 new release 1/2 mile long range (in ideal situations) 7 channel secure wireless intercom system. It integrates the latest technology to be the most trusted intercom system for home and office ; Individually Function and Easy Using: Powerful and Individually Function, Monitor, Talk, VOX(Voice Operated Exchange), Group call function. Monitor function can monitor 10 hours at once. Group function (conference call) can call all the stations in intercom system. VOX(Voice Operated Exchange)