Description: Safety & Security first.. Know who it is before you open your doors for them.. Two-wire connection With a new ABS plastic Excellent consumer side of the tone circuit, intercom voice clarity Effective distance of 300 meters above the intercom Easy installation easy to use Specifications: 50mW Audio Distortion Rate Talk time: unlimited free calls Input voltage: AC220V 50Hz, output voltage: AC12V 1200mA Frequency response: 300 ~ 3400 HZ Operating voltage: DC12V Power consumption: static What’s in the box 1x 2-Way Intercom System Unlock Function RL-3206B