VEX-B21L - Intercom ZKTeco - Free user manual and instructions
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| Product Type | Video Doorbell Intercom |
| Brand | ZKTeco |
| Model | VEX-B21L |
| Display | 7-inch TFT LCD touchscreen |
| Camera | 1/2.8" CMOS, 2MP, wide-angle lens |
| Night Vision | IR LEDs up to 5 meters |
| Audio | Full-duplex two-way audio with echo cancellation |
| Network | Ethernet (10/100 Mbps) and Wi-Fi 802.11 b/g/n |
| Power Supply | DC 12V, 2A (PoE optional) |
| Dimensions (Unit) | 140 mm x 90 mm x 25 mm (H x W x D) |
| Weight | 350 g |
| Operating Temperature | -10°C to 50°C |
| Storage Temperature | -20°C to 60°C |
| Protection Rating | IP54 (indoor unit) |
| Main Functions | Video doorbell, remote unlock, audio/video intercom, motion detection, snapshot, local recording (microSD up to 32GB) |
| App Support | ZDoor App (iOS/Android) |
| Storage | microSD up to 32GB (not included) |
| Mounting | Wall mount (screws included) |
| Package Contents | Main unit, mounting bracket, power adapter, Ethernet cable, screw kit, user manual |
| Cleaning and Maintenance | Wipe with a soft dry cloth; use mild soap if needed; avoid solvents |
| Security | Encrypted video stream, secure Wi-Fi protocols, password protection |
| Repairability | Contact authorized service center; no user-serviceable parts |
| Warranty | 1 year limited warranty |
Frequently Asked Questions - VEX-B21L ZKTeco
How do I reset the VEX-B21L to factory defaults?
Press and hold the reset button (located on the bottom) for 10 seconds using a paperclip until you hear a beep. The device will reboot and restore default settings.
Can I connect the intercom to my existing doorbell wiring?
The VEX-B21L is designed for 12V DC power supply. It requires a dedicated power adapter or PoE switch. It is not compatible with traditional AC doorbell transformers without modification.
What app do I need to use with this device?
You need the ZDoor App, available for iOS and Android. Search for 'ZDoor' in your app store.
How do I pair the indoor unit with the outdoor camera?
Both units must be on the same network. Open the ZDoor app, go to 'Add Device', scan the QR code on the camera, and follow in-app instructions.
Does the VEX-B21L support two-way audio?
Yes, it has full-duplex two-way audio with echo cancellation for clear communication.
What is the maximum microSD card size supported?
The device supports microSD cards up to 32GB. Use a Class 10 card for optimal performance.
Can I view the camera feed remotely?
Yes, through the ZDoor app you can view live video and receive notifications from anywhere with an internet connection.
How do I clean the touchscreen?
Use a soft, lint-free cloth slightly dampened with water or a mild screen cleaner. Do not spray directly onto the screen.
Does the intercom come with a power adapter?
Yes, the package includes a 12V DC 2A power adapter and an Ethernet cable.
Is the device weatherproof?
The indoor unit is rated IP54 (protected against dust and splashing water). It should be installed indoors or in a sheltered area.
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