Shelly Plus Wall Dimmer

Device identification

Name: Shelly Plus Wall Dimmer

Model: SNDM-0013US

Device SSID: ShellyPlusWDUS-XXXXXX

BLE Model ID: –

Short description

Shelly Plus Wall Dimmer is a smart Wi-Fi wall dimmer that switches on/off and adjusts the brightness
of compatible dimmable lights. Designed to fit standard US wall switch boxes, it combines intuitive
touch control with advanced automation options. Powered by Gen2 firmware, it can operate standalone
on local Wi-Fi or through cloud-based automation services. The device can be accessed and configured
remotely, featuring an embedded web interface for local monitoring and control.

Main features

• Night mode
• Weekly schedules
• Auto on/off timers
• Adjustable brightness with touch slider
• Wi-Fi and Bluetooth connectivity
• Embedded Web Interface for configuration

Use cases

• Residential: Dimming and automation for home lighting
• MDU: Apartments, condominiums, hotels
• Light commercial: Offices, retail stores, restaurants, gas stations
• Government/municipal: Smart lighting in public spaces
• University/college: Classroom and dorm automation

Integrations

Google

Amazon

Samsung SmartThings

Simplified internal schematics

Shelly Plus Wall Dimmer internal schematics

Device electrical interfaces

Inputs: 2 line wires: 1 black L and 1 white N

Ground: 1 green ⏚ wire

Output: 1 red OUT wire

Connectivity

Wi-Fi

Bluetooth

Safety function

Overheating protection

Overvoltage protection

Overcurrent protection

Supported load types

• Incandescent lights
• Dimmable LED lights
• Dimmable CFL lights

User interface

Inputs:

• Power button with LED indication:

  – Press → turn lights on/off

  – Hold 5s → enable AP

  – Hold 10s → factory reset


• Slider with brightness LED indication:

  – Slide up → increase brightness

  – Slide down → decrease brightness

Outputs: Power button and brightness LEDs



Blue Wi-Fi LED*:

• AP enabled, Wi-Fi disabled → flashing (1s ON / 1s OFF)

• Wi-Fi enabled, not connected → slow flash (1s ON / 3s OFF)

• Wi-Fi connected, Cloud disabled or connected → steady blue

• Cloud enabled, not connected → very slow flash (1s ON / 5s OFF)

• Button held 5s → fast flash (⅕s ON / ½s OFF)

• Button held 10s or OTA → very fast flash (⅕s ON / ⅕s OFF)



White Power LED** (lights ON):

• AP enabled, Wi-Fi disabled → flashing (1s ON / 1s OFF)

• Wi-Fi enabled, not connected → slow flash (1s ON / 3s OFF)

• Wi-Fi connected, Cloud disabled or connected → steady white

• Cloud enabled, not connected → very slow flash (1s ON / 5s OFF)

• Button held 5s → fast flash (⅕s ON / ½s OFF)

• Button held 10s or OTA → very fast flash (⅕s ON / ⅕s OFF)



Brightness LED indication:

• Single white dot lit → lights OFF

• Vertical bar of dots → lights ON; each dot = +14% brightness (top dot = 84–100%)

* Blue Wi-Fi LED can be enabled (default) or disabled by the user.

** White Power LED can be configured to match output, invert, stay always ON, or stay always OFF.

Physical

Size without face plate and wires (HxWxD): 104×44×39 mm ±0.5 / 4.09×1.73×1.50 in ±0.02

Size with face plate and without wires (HxWxD): 120×70×39 mm ±0.5 / 4.72×2.76×1.50 in ±0.02

Weight without face plate: 105 g / 3.70 oz

Weight with face plate: 121 g / 4.28 oz

Shell material: ABS

Color: White

Environmental

Ambient temperature: −20 °C to 40 °C (−5 °F to 105 °F)

Humidity: 30–70% RH

Electrical

Power supply (AC): 100–120 V, 50/60 Hz

Power supply (DC): N/A

Power consumption: < 3 W

Output ratings

Max load power at 120 V~: 400 W (incandescent); 150 W (dimmable LED/CFL)

Radio

RF band: 2400–2495 MHz

Max RF power: < 20 dBm

Wi-Fi protocol: 802.11 b/g/n

Wi-Fi range: Up to 30 m / 100 ft indoors; 50 m / 160 ft outdoors (depends on conditions)

Bluetooth protocol: 4.2

Bluetooth range: Up to 10 m / 33 ft indoors; 30 m / 100 ft outdoors (depends on conditions)

MCU

CPU: ESP32

Flash: 4 MB

Firmware capabilities

Webhooks: 20 (up to 5 URLs each)

Scripting: Yes

MQTT: Yes

CoAP: No