2-wire SIP Indoor unit, 7″, Linux

2-wire Indoor unit (Linux Version)
1. 7” capacitive touch screen with energy saving mode
2. Reception of a HD picture from the door communicator
3.Two-way communication based on SIP v2.0 protocol
4. Powered by Akuvox NS-2 or external source
5. Supports US or European electrical wall box mounting
6. Bluetooth, and Wireless feature
7. Support connecting with R20A-2 or NS-2 through 2-wire cable