4擝/W WIRES VIDEO DOOR PHONE (CMOS/CCD) 4擣LAT CRT TRANSMIT FREQUENCY: 2.4GHZ TRANSMIT POWER: 10-50MW TRANSMIT DISTANCE:MORE THAN 50 METER RECEIVE SENSITIVITY:ABOVE 0.3UV WITH THE FUNCTIONS OF MONITOR, INTERCOM AND UNLOCK POWER SOURCE:AC/DC ADAPTOR(DC 13.5V/1.2A)