This is audio entry systems of apartment buildings, and this is derect call systems, which means that there is press button which fixed with fitted room numbers on the out door panel, so the visitors just need to press the call button to remind the host, it can connect 12 to 32 apartments, and it is very easy to cooperate and install, its has such following fuctions and features:
1. Two way talking
2. Unlock
3. Intercommunication
4. Easy installation
5. Cheaper price
6. First Class Quality
7. Two year Guarantee
8. CE and RHOS certification