... 150-180m; 2. With micro-dealing technology; auto-remote control, fine characteristics and high reliability; 3. The TFT 2.4" digital color ... , 24 hour monitoring, calling , speaking and unlocking remote controlling, etc; 6. One indoor video phone can control Max.5 pcs outdoor phones at ... /1A Power 1PC, 5V/1A Power 1PC, Screw 4PCS Wireless Video Door Phone Security System