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04 Reset & Teardown (FCC ID 2APN5SNZB-04)

Factory reset and internal photos for Generic IoT 04. Unknown smart plug.

January 16, 2026 1 min read

04 internal photo

Before you buy the Generic IoT 04, check what's inside.

This is a Sonoff SNZB-04, a Zigbee-based wireless door/window sensor. It is designed to detect the open/closed status of doors and windows when paired with a compatible Zigbee hub like the SONOFF ZigBee Bridge or other Zigbee 3.0 gateways.

⚠️ NOTE: Ensure correct battery polarity when replacing the CR2032 battery.

Quick Specs

  • Manufacturer: Generic IoT
  • Model: 04
  • Protocol: WiFi
  • Chipset: Unknown
  • Ecosystem: Unknown
  • App: Unknown

🔧 Geek Corner (Flashing Info)

  • Chipset: Unknown
  • Flashable: ❌ No
  • Info: Zigbee devices, especially those from Sonoff's SNZB line, are typically not designed for flashing with custom firmware like Tasmota or ESPHome and often use proprietary chipsets or secure bootloaders.

User Manual

Scanned pages from the official user manual:

04 Manual

04 Manual

04 Manual

04 Manual

04 Manual

04 Manual

04 Manual

04 Manual

04 Manual

04 Manual

External Photos

Photos of the device exterior:

04 Exterior

04 Exterior

04 Exterior

04 Exterior

04 Exterior

Internal Photos

Teardown photos showing the PCB and components:

04 PCB

04 PCB

04 PCB

04 PCB

04 PCB

Verdict

The 04 is a WiFi device from the Unknown ecosystem.

📄 Click to view full text manual (SEO)
SNZB-04
User manual V 1.0
Wireless Door/Window Sensor
中文-------1-6 English-------7-12 
>
1
<15mm
2
>
eWeLink
eWeLink
1. 下载APP
ZBBridge
 添加。
3
产品型号: SNZB-04
电池型号: CR2032
无线协议: ZigBee (IEEE 802.15.4)
工作温度: -10-40℃
工作湿度:10-90%RH(无冷凝)
安装距离: <15mm
产品规格: 发射器(47x27x13.5mm) 
 磁铁(32x15.6x13mm) 
ZBBridge
25s
>
4
5
6
Pull out the battery insulation sheet
The device can be operated intelligently via working 
with the SONOFF ZigBee Bridge to communicate with 
other devices.
The device can work with other gateways supporting 
ZigBee 3.0 wireless protocol. Detailed information 
is in accordance with the final product.
>
Install the device
1. Tear off the protective film of the 3M adhesive.
7
<15mm
2.Try to align the mark line on the magnet with that 
 on the transmitter during installation.
3. Install them in the opening and closing area 
 separately.
Make sure the installation gap is less than 15mm 
when the door or the window is closed.
8
ZBBridge
Added:0
No child device,please add.
Add
>
Operation instruction
eWeLink
eWeLink
1. Download APP
Connect the Bridge before adding the sub-device
Access eWeLink APP, select the Bridge that you want 
to connect, and tap “Add” to add a sub-device. Then 
long press reset button on the device for 5s until the 
LED indicator flashes three times, which means the 
device has entered the pairing mode, and be patient 
until pairing completes.
If the addition failed, move the sub-device closer 
to the Bridge and try again.
2. Add sub-devices
9
SONOFF ZigBee Bridge supports 
connecting multiple sub-devices at 
the same time.
Connecting
Keep the device close 
enough to the hub.
25s>
Power the Bridge on, access the Bridge page in the 
eWeLink APP, and tap “Add”. Then set the sub-device 
to be pair to the pairing mode, and be patient until the
pairing completes.
ZBBridge
Added:0
No child device,please add.
Add
Add Device
Looking for device
3 devices Found
Specifications
Model: SNZB-04
Battery model: CR2032
Working voltage: 3V
Wireless connection: ZigBee (IEEE 802.15.4)
Working temperature : -10-40℃
Working humidity: 10-90%RH (non-condensing)
Installation gap: <15mm
Material: PC
Dimension: Transmitter(47x27x13.5mm) 
 Magnet(32x15.6x13mm)
10
Align the mark lines
Transmitter
Magnet
Product Introduction
Reset button
LED indicator
Features
Low-energy Low battery notification Smart scenes 
SNZB-04 is a ZigBee low-energy wireless door/
window sensor that makes you know the opening/
closing status of door and window by separating 
the magnet from the transmitter. Connect it with the 
Bridge and you can create a smart scene to trigger 
other devices.
11
Application
Door Window
Delete sub-devices
Long press the reset button on the sub-device for 5s 
until the LED indicator flashes three times. In this 
case, the sub-device is deleted from the Bridge 
successfully.
Users can delete sub-devices directly from the 
sub-device page on APP.
Note:
● Do not install outside the door/window.
● Do not install in the unstable position or in the place 
 expo...