Doorphone Intercom
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 7 LCD 2 Apartments Video Doorbell Door phone Intercom $249.00 Time Remaining: 11d 50m Buy It Now for only: $249.00 |
 VIDEO DOOR PHONE Intercom Camera LCD Monitor safe lock security sensor light $121.49 Time Remaining: 3d 7h 47m |
 C2 24GHZ WIRELESS DOOR PHONE 2X INDOOR STATIONS ACCESS ENTRY CONTROL INTERCOM $141.82 Time Remaining: 28d 14h 24m Buy It Now for only: $141.82 |
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 B9B WIRED SINGLE DOORPHONE ACCESS ENTRY INTERCOM SYSTEM $74.64 Time Remaining: 7d 12h 18m Buy It Now for only: $74.64 |
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 IS15 24GHZ WIRELESS AUDIO DOOR PHONE CHIME ACCESS ENTRY CONTROL INTERCOM $70.71 Time Remaining: 27d 13h 52m Buy It Now for only: $70.71 |
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 B9 24GHZ WIRELESS AUDIO DOOR PHONE CHIME ACCESS ENTRY CONTROL INTERCOM SYSTEM $82.10 Time Remaining: 26d 7h 38m Buy It Now for only: $82.10 |
 1TO2 35 B W LCD TFT Video Doorbell phone Intercom Doorphone $123.00 Time Remaining: 15d 25m Buy It Now for only: $123.00 |
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 7 Wireless Video Door Phone Audio Visual Intercom System 1V2 $290.73 Time Remaining: 3d 5h 41m Buy It Now for only: $290.73 |
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 C9B NEW AUDIO DOOR PHONE INTERCOM ELECTRIC LOCK KIT $119.43 Time Remaining: 8d 12h 29m Buy It Now for only: $119.43 |
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 C2A 24GHZ WIRELESS DOOR PHONE 3X INDOOR STATIONS ACCESS ENTRY CONTROL INTERCOM $246.33 Time Remaining: 28d 14h 44m Buy It Now for only: $246.33 |
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 Two 7inch LCD Monitor Door phone Intercom System with one Camera Video Brand new $174.99 Time Remaining: 8d 17h 25m Buy It Now for only: $174.99 |
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 C1 Wireless Steel Weatherproof Door phone Intercom $131.37 Time Remaining: 26d 5h 50m Buy It Now for only: $131.37 |
 Wireless Intercom Video Door Phone Camera + Monitor $207.45 Time Remaining: 17d 23h 9m Buy It Now for only: $207.45 |
 Two 7inch LCD Monitor 1 Camera Video Door Bell Doorphone Intercom System $174.99 Time Remaining: 8d 17h 35m Buy It Now for only: $174.99 |
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 C2A 24GHZ WIRELESS DOOR PHONE 3X INDOOR STATIONS ACCESS ENTRY CONTROL INTERCOM $246.33 Time Remaining: 6h 11m Buy It Now for only: $246.33 |
 Camera Video Door Phone Interphone Door Bell Intercom Wireless 35 Monitor $159.00 Time Remaining: 20d 6h 50m Buy It Now for only: $159.00 |
 best 7 LED Color Video Door Phone Intercom 300KP CMOS Lens Camera $147.00 Time Remaining: 1d 3h 51m Buy It Now for only: $147.00 |
 Video Door Phone Video Security Intercom System New $129.00 Time Remaining: 15d 1h 40m Buy It Now for only: $129.00 |
 7 Wired Video Door Phone Visual Intercom Entry System 2V4 $392.88 Time Remaining: 11d 9h 43m Buy It Now for only: $392.88 |
 One 7inch LCD Monitor Door phone Intercom System with one Camera Video Brand new $114.99 Time Remaining: 16d 14h 33m Buy It Now for only: $114.99 |
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 7 LCD VIDEO DOOR PHONE INTERCOM SECURITY CAMERA SYSTEM $225.00 Time Remaining: 16d 6h 1m Buy It Now for only: $225.00 |
 C9C NEW AUDIO DOOR PHONE INTERCOM ELECTRIC LOCK KIT $214.98 Time Remaining: 9d 13h 39m Buy It Now for only: $214.98 |
 C5 COLOUR LCD VIDEO 2 INDOOR 1 OUTDOOR DOORPHONE ACCESS ENTRY CONTROL INTERCOM $283.66 Time Remaining: 29d 9h 46m Buy It Now for only: $283.66 |
 7 TFT LCD Wireless Video Doorbell Doorphone Intercom $1,999.00 Time Remaining: 6d 23h 20m Buy It Now for only: $1,999.00 |
 Video DoorPhone Intercom kit 1 door station 3x 7 LCDs $495.05 Time Remaining: 27d 10h 54m Buy It Now for only: $495.05 |
 NEW Daitem D5731GB Wireless Doorphone Intercom Kit $582.26 Time Remaining: 12d 13h 31m Buy It Now for only: $582.26 |
 Doorphone Intercom System One 7inch LCD Monitor 1 Camera Video Brand new US $114.99 Time Remaining: 17d 22h 54m Buy It Now for only: $114.99 |
 C0 WIRED 2WAY HANDSFREE DOOR PHONE ACCESS ENTRY INTERCOM SYSTEM WITH DOOR STRIKE $54.99 Time Remaining: 28d 12h 12m Buy It Now for only: $54.99 |
 7 LCD TFT Video Doorbell Door phone Intercom Doorphone $116.50 Time Remaining: 8d 5h 29m Buy It Now for only: $116.50 |
 Home Camera Two 7 LCD Color Video Doorphone Intercom Bell System Brand new US $174.99 Time Remaining: 8d 17h 28m Buy It Now for only: $174.99 |
 Two 7 Color LCD Monitor 1 Camera Video Doorphone Doorbell Intercom System $174.99 Time Remaining: 8d 17h 47m Buy It Now for only: $174.99 |
 B9B WIRED SINGLE DOORPHONE ACCESS ENTRY INTERCOM SYSTEM $74.64 Time Remaining: 29d 15h 21m Buy It Now for only: $74.64 |
 Video Door Phone Intercom System with Two 7 LCD Monitors and One Camera $174.99 Time Remaining: 8d 18h 16m Buy It Now for only: $174.99 |
 4 BW CRT wired video doorphone home intercom system $66.00 Time Remaining: 21d 7h 6m Buy It Now for only: $66.00 |
 CCTV Intercom Door phone 7 TFT LCD w IR Camera system $219.00 Time Remaining: 16d 7h 20m Buy It Now for only: $219.00 |
 Video DoorPhone Intercom kit 1 door station 3x 7 LCDs $500.00 Time Remaining: 27d 10h 52m Buy It Now for only: $500.00 |
 1 door station Video DoorPhone Intercom kit 2x 7 LCDs $380.33 Time Remaining: 28d 1h 44m Buy It Now for only: $380.33 |
 C1 Wireless Steel Weatherproof Door phone Intercom $131.37 Time Remaining: 6h 11m Buy It Now for only: $131.37 |
 Home security 7 TFT LCD Intercom Door phone w Camera $225.00 Time Remaining: 23d 3h 53m Buy It Now for only: $225.00 |
 COMMAX 7 Video Door Phone Intercom Panel CDV 72BE $415.69 Time Remaining: 15d 9h 50m Buy It Now for only: $415.69 |
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Four types of modern doorbell
Modern doorbell can be divided into wired doorbell , wireless doorbell (remote control doorbell), intercom doorbell, video door phone
There are two types of Wired doorbell:DC and AC power.
DC supply power by battery, 220V power supply is used by AC. DC doorbell structure is simple, using IC block, and lower cost. AC doorbell is the principle of making use of power coil.
Remote control doorbell has two sub-DC and AC.
The remote control of DC switch on dry batteries, dry batteries in the doorbell is also used. Communication with the remote control switch on the battery while the doorbell AC power supply, the principle of just more than wired doorbell one more launcher, and a receiver. Wired doorbell has the advantage of stable and reliable, defects which had to wait a good line, wireless doorbell without row of the advantage of cable can be use; Disadvantages: have distance limitations vulnerable to interference.
Generation doorbell, intercom, video doorbell.
Doorbell intercom doorbell in the original function, add the intercom, it points to the indoor unit and outdoor unit. Indoor unit looks like a telephone, listen to tell. Outdoor unit is a control panel on a doorbell and intercom button holes for indoor and outdoor dialogue.
The wireless video door phone is developed based on intercom doorbell. The most advanced doorbell intercom system, based on its intercom, increase in the indoor unit display an increase in outdoor camera, so to those who looks at a glance, the function adds an automatic unlock button, convenient and to match the electronic door locks.
For more information please refer to:
http://www.espow.com/wholesale-4-tft-lcd-wireless-video-doorphone.html
About the Author
April 16th, 2009 in
Home Security | tags: asterisk, door, door phone intercom, door phone intercom circuit, door phone intercom system, doorphone, intercom, panasonic door phone intercom, video door phone intercom, voip