... Zhianda Video Intercom Door Phone ZAD216-7C / ZAD525-1C (1 to 1 direct AC) - 1 x unit ... unit) Zhianda Video Intercom Door Phone ZAD216-7C / ZAD525-1C (1 to 1 direct AC) Secure your life style ... ZAD216-7C(as door unit) and 1 unit ZAD525-1C (as room unit). Door unit is typically installed ... Door Station with Four Room Station Specifications: Model ZAD525-1C Power source AC220, 50-60Hz RMS output power ...