Functions:
1) This system can be mated with 1 - 3 indoor units
2) The outdoor unit can call the indoor unit
3) While using the intercom the user can unlock the elec-lock on the
outdoor by the indoor unit
4) Pressing the monitor key allows the user to see what is happening
in front of the outdoor unit
5) The ringing is generated by a CPU and has a nice sound
6) The door set is equipped with infrared diodes to ensure clear
pictures in the night
7) The outdoor unit can use the password to unlock the door

Specifications:
1) Camera head: 1/3"CCD
2) Lens: F=2 (hand focusing), 92 degree visual angle
3) Resolving power: 420 TV lines
4) Illumination: 0.01LUX
5) Video output: 1VP-P/75ω
6) Supply voltage: DC 18V (supplied by the indoor unit)
7) Wire: 4 wires
8) Operating temperature: -40  70oC
9) Size: 125 x 175 x 38mm

Villa Type Indoor Unit Specifications:
1) Monitor: 4" CRT
2) Resolving power: 400 TV lines
3) Synchronization: 15625HZ, 50HZ
4) Video input: 1VP-P/75ω
5) Supply voltage: DC18V
6) Operating temperature: -10 - 55oC
7) Size: 225 x 195 x 75mm (V-2 type), 225 x 185 x 75mm (V-3 type),
230 x 210 x 55mm (V-4 type
8) Installation method: hanging type
9) Power of the indoor unit: input voltage AC 220V 50Hz, output
voltage DC 18V

Output current: 1,000mA