Functions:
1) Can watch and talk with a visitor through the screen of the indoor
unit and unlock the outdoor
2) Can call the management machine by pressing "Alarm" key on the
indoor unit
3) The user can call and talk to others through the indoor units of
different rooms
4) The system adopts one code for each customer
5) Through the management machine the management group can monitor
what is happening in front of the outdoor unit.
6) Through the management machine, the user can call and talk with
another person in a different unit by the indoor units
7) The user can call the management machine by pressing the " Security"
key on the outdoor unit, and the security guard can talk with the
caller and unlock the outdoor with the management machine
8) The outdoor unit can be mated with several assistant indoor units

System components:
1) Door to door video online outdoor unit
2) Door to door video security indoor unit
3) Switch power

Specifications:
Door to door video online outdoor unit:
1) Camera head: 1/3〞 CCD
2) Lens: F=2 (hand focusing), 92 degree visual angle
3) Resolving power: 420 V lines
4) Illumination: 0.01LUX
5) Video output: 1VP-P/75ω
6) Display: 4-digit LED
7) Intercom time limit: 75 seconds
8) Password: 1 -6 digit number
9) Card type: ID card
10) Card capacity: 15 pieces/user
11) Read distance: 3 - 6mm
12) Audio SNR: ≥50dB
13) Audio distortion: <5%
14) Working temperature: -40  70oC
15) Working voltage: DC 12V 10%
16) Power consumption: static state≤160mA
17) Dynamic state ≤350mA
18) Size: 360 x 165 x 50mm (aluminum type I), 342 x 140 x 62mm (aluminum
type II)
19) Installation method: embedded on a wall or an iron door

Indoor unit: JB-2004V
1) Specifications:
2) Monitor: 4〞B/W (CRT)
3) Resolving power: 420 TV lines
4) Video output: 1VP-P/75ω
5) Audio distortion: <5%
6) Working current: static state: ≤30mA (without detector)
7) Dynamic: ≤100mA (without detector)
8) Working temperature: -10 - 55oC
9) 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), 297 x 225 x 62mm (V-7 type),
284 x 240 x 60mm (V-8 type), 297 x 225 x 62mm (V-7 type),
284 x 240 x 60mm (V-8 type), 347 x 253 x 67(V-9 type)
10) Installation method: hanging type or built-in type