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RM433 Reset & Teardown (FCC ID 2APN5RM433)

Factory reset and internal photos for Sonoff (Itead) RM433. Sonoff smart plug.

January 15, 2026 1 min read

RM433 internal photo

Before you buy the Sonoff (Itead) RM433, check what's inside.

The Sonoff RM433 is a 433MHz RF remote control designed for simple wireless automation tasks. It is powered by a 27A battery and is intended to control compatible Sonoff or other 433MHz enabled devices.

⚠️ NOTE: Ensure correct battery polarity when replacing the 27A battery; do not attempt to recharge the battery as it is non-rechargeable.

Quick Specs

  • Manufacturer: Sonoff (Itead)
  • Model: RM433
  • Protocol: WiFi
  • Chipset: ESP/CK Chip
  • Ecosystem: Sonoff
  • App: eWeLink

🔧 Geek Corner (Flashing Info)

  • Chipset: Unknown
  • Flashable: ❌ No
  • Info: This is a simple RF remote control and does not contain a microcontroller or Wi-Fi/Zigbee module that would typically be flashable with custom firmware like Tasmota or ESPHome.

User Manual

Scanned pages from the official user manual:

RM433 Manual

RM433 Manual

RM433 Manual

RM433 Manual

External Photos

Photos of the device exterior:

RM433 Exterior

RM433 Exterior

RM433 Exterior

RM433 Exterior

RM433 Exterior

Internal Photos

Teardown photos showing the PCB and components:

RM433 PCB

RM433 PCB

RM433 PCB

RM433 PCB

Verdict

The RM433 is a WiFi device from the Sonoff ecosystem.

📄 Click to view full text manual (SEO)
User manual 
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Before use the equipment, please reading this instruction carefully! 

Product: 433MHz remote control 
Model: RM433 
Frequency band: 433MHz 
Parameters: 12VDC (powered by a non-rechargeable, type 27A battery) 

ATTENTION 
To comply with the published standards, the following must be observed when using this 
equipment. 

1. The equipment intended to be operated up to 2000m above sea level. 
2. The rated maximum ambient temperature must not exceed 45° C. 
3. Naked flame sources, such as candles, must not be placed on the appliance. 
4. The equipment supply by a non-rechargeable battery, so don’t charge for the battery! 
5. When replace the battery please choose the type 27A battery, and the children should be 
supervision when replace the battery, it may cause choke hazard! 

Operating instruction: 

RM433 Icons 

1. Install the specified battery to the equipment 
2. Connected to end product which will be controlled by the equipment 
3. The you can control the product according to the function figure of the button 

User manual 
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Mounting step: 

The equipment have a support which could be mounting on the wall, please use suitable size screws 
or 3M adhesive tape to fixed on the wall. 

FCC Statement: 
This equipment has been tested and found to comply with the limits for a 
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are 
designed to provide reasonable protection against harmful interference in a 
residential installation. This equipment generates uses and can radiate radio 
frequency energy and, if not installed and used in accordance with the 
instructions, may cause harmful interference to radio communications. 
However, there is no guarantee that interference will not occur in a particular 
installation. If this equipment does cause harmful interference to radio or 
television reception, which can be determined by turning the equipment off 
and on, the user is encouraged to try to correct the interference by one or more 
of the following measures: 
• Reorient or relocate the receiving antenna. 
• Increase the separation between the equipment and receiver. 
• Connect the equipment into an outlet on a circuit different from that to 
which the receiver is connected. 
• Consult the dealer or an experienced radio/TV technician for help. 
Caution: Any changes or modifications to this device not explicitly approved 
by manufacturer could void your authority to operate this equipment. 
This device complies with part 15 of the FCC Rules. Operation is subject to 
the following two conditions: (1) This device may not cause harmful 
interference, and (2) this device must accept any interference received, 
including interference that may cause undesired operation. 

User manual 
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Symbol interpretation: 

This product must not be disposed together with the domestic waste. This product has to 
be disposed at an authorized place for recycling of electrical and electronic appliances. 
By col...