4CHR3 Reset & Teardown (FCC ID 2APN54CHR3)

Before you buy the Sonoff (Itead) 4CHR3, check what's inside.

The Sonoff 4CHR3 is a 4-gang Wi-Fi smart switch designed to control multiple appliances remotely via the eWeLink app. It operates on the 2.4GHz Wi-Fi band and supports mains voltage input, making it suitable for direct integration into home electrical systems.

⚠️ NOTE: Disconnect Mains before wiring. Ensure correct live and neutral wire connections.

Quick Specs

Manufacturer: Sonoff (Itead)
Model: 4CHR3
Protocol: WiFi
Chipset: ESP/CK Chip
Ecosystem: Sonoff
App: eWeLink

🔧 Geek Corner (Flashing Info)

Chipset: ESP8266
Flashable: ✅ Yes
Info: Known to be flashable with Tasmota/ESPHome via serial connection.

User Manual

Scanned pages from the official user manual:

4CHR3 Manual

External Photos

Photos of the device exterior:

4CHR3 Exterior

Internal Photos

Teardown photos showing the PCB and components:

4CHR3 PCB

Verdict

The 4CHR3 is a WiFi device from the Sonoff ecosystem.

📄 Click to view full text manual (SEO)

4-gang Wi-Fi Smart Switch
Specifications:
Model: 4CHR3
Input: 100-240V AC 16A Max
Output: 100-240V AC 10A/Gang 16A/Total 
Wi-Fi: IEEE 802.11 b/g/n 2.4GHz Material:PC 
V0
Dimension:145x90x34mm 
WIFI Frequency Range:2412-2472MHz for CE 
 2412-2462MHz for FCC
Max Transmit Power: <20dBm 
产品参数:
型号: 4CHR3
输入: 100-240V AC 16A Max
输出: 100-240V AC 10A/Gang 16A/Total
Wi-Fi: IEEE 802.11 b/g/n 2.4GHz 
产品材料:PC V0
产品规格:145x90x34mm 
Wi-Fi智能开关模块（四通道）
4CHR3 
4CHR3 
L 1
L 2
L 3
L 4
In Out Out Ou t Ou t
N N N N N
L 1
L 2
L 3
L 4
L L1 L2 L3 L4
100-240V AC
100-240V AC
N L
N N N
L In
L3 Out
L4 Out
L 1
L 2
L 3
L 4
In Out Out Ou t Ou t
N N N N N
L 1
L 2
L 3
L 4
L L1 L2 L3 L4
100-240V AC
N
N
N
L In
L3 Out
L4 Out
L 1
L 2
L 3
L 4
In Out Out Ou t Ou t
N N N N N
L 1
L 2
L 3
L 4
L L1 L2 L3 L4
100-240V AC
N
N
N
L In
L3 Out
L4 Out
L 1
L 2
L 3
L 4
In Out Out Ou t Ou t
N N N N N
L 1
L 2
L 3
L 4
L L1 L2 L3 L4
警告：接线前请断电
L 1
L 2
L 3
L 4
In Out Out Ou t Ou t
N N N N N
L 1
L 2
L 3
L 4
L L1 L2 L3 L4
100-240V AC
N L
N N N
L In
L3 Out
L4 Out
L 1
L 2
L 3
L 4
In Out Out Ou t Ou t
N N N N N
L 1
L 2
L 3
L 4
L L1 L2 L3 L4
100-240V AC
Warning: please cut off the power before wiring.
上电
通电后，设备首次使用，默认进入快速模式(T ouch)，
Wi-Fi指示灯呈两短一长闪烁状态。
产品安装时，请确保产品输入线已断开，
以免发生点击。
确保零火线接入无误。
Make sure the neutral wire and live wire connection is correct.
注意：三分钟内没有进行配网，设备将退出快速模式。如需
 再次进入，长按触摸开关键5秒直到Wi-Fi指示灯呈两短
 一长闪烁即可。
Power on
After powering on, the device will enter the quick pairing 
mode (Touch) during the ﬁrst use. The Wi-Fi LED indicator 
changes in a cycle of two short and one long flash.
Note: The device will exit the quick pairing mode (Touch)if not 
 paired within 3mins. If you want to enter thismode, please 
 long press the Touch switch for about 5s until the Wi-Fi 
 LED indicator changes in a cycle of two short and one 
 long flash and release.
ඳ
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Manufacturer: Shenzhen Sonoff Technologies Co., Ltd. 
Importer:xxx 
Address:xxx
Statement
The The 4-gang Wi-Fi Smart Switch shall be so 
constructed that it can be operated in Eu member 
states (including Germany, France, Belgium, etc.) shall 
be so constructed that it can be operated in Eu 
member states (including Germany, France, Belgium, 
etc.)without infringing applicable requirements on the 
use of radio spectrum....