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Installations

Dimming with BLU Wall Switch

Pair a battery wall switch straight to a dimmer over Bluetooth — no gateway.

Updated: September 2026

What this covers

A Shelly BLU Wall Switch paired straight to a relay or dimmer over Bluetooth. The link is entirely local: no Wi-Fi, no internet, no cloud account, and no gateway, and it supports smooth dimming.

Requirements

  • A Shelly relay or dimmer — Gen3, Gen4 or Pro — on current firmware
  • A Shelly BLU Wall Switch 4 ZB, or a BLU RC Button 4 or BLU Button Tough 1
  • Both within range. The official range is 10 metres indoors, but in practice we often see up to 30 metres

Which switch to order

Only the Standalone variant is available at the moment. It mounts directly to the wall — no frame and no adapter. Double-sided tape is not supplied, so bring your own.

Shelly BLU Wall Switch 4 ZB Standalone
Shelly BLU Wall Switch 4 ZB Standalone EAN 3800238073053

Four buttons, battery powered. Mounts directly on the wall.

The Standalone switch can also be fitted inside an existing frame: take it apart and use the adapter for the range on the wall.

Switch range Adapter EAN
Gira / Merten / Exxact / Elko 3800235266922
Legrand 3800235266953
Busch-Jaeger / Jussi 3800235266946

Check the frame on the wall before ordering. The adapter is not universal.

Pairing

Four steps. Only step 1 differs by installation.

1
Relay

Put the relay or dimmer into pairing mode

Method A — from the physical switch Use this when a momentary spring switch is already wired to the SW input. Method B — from the web interface Use this when there is no physical switch — the usual case when the battery switch is the only control.

Method A — from the physical switch

Press the wired switch four times quickly. The light blinks.

A Shelly Dimmer Gen3 wired to a wall switch, with the switch pressed four times to start pairing mode and the lamp blinking to confirm
Click to enlarge.

Method B — from the web interface

  1. Connect to the relay’s access point, or open its IP address if it is already on the network
  2. Open the output, for example Light (0)
  3. Go to Remote control and tap Add remote control
  4. Select Find a new remote and tap Create

The light blinks. See the web interface.

Five phone screenshots of the device web interface: joining the device Wi-Fi network, opening the output, Remote control, Add remote control, and Find a new remote followed by Create
Click to enlarge.
2
Switch

Put the wall switch into pairing mode

Press any button four times quickly. The light blinks.

It can take up to five seconds before the blink appears. Do not press again while you wait, or you restart the sequence.

On older Bluetooth-only devices without Zigbee, press and hold any two buttons for ten seconds instead.

A four-button BLU wall switch with the top left button pressed four times quickly, and the lamp blinking to confirm
Click to enlarge.
3
Switch

Choose the ON button

Press the button you want as ON / dim up. The light blinks.

The opposite button becomes OFF / dim down on its own. Press top left, and bottom left becomes off.

Pressing the top left button of the BLU wall switch to assign it as on, with the result shown as top left green for on and dim up and bottom left red for off and dim down
Click to enlarge.
4
Test

Confirm it works

  • ON button — press to switch on, hold to dim up
  • OFF button — press to switch off, hold to dim down

On a dimmer, hold until the level is right and release. Test both buttons before you leave the room.

Two BLU wall switches showing the button pairs: pairing with a left button gives on and dim up top left and off and dim down bottom left, pairing with a right button gives the same on the right-hand pair
Click to enlarge.

Tips & troubleshooting

  • No blink after four presses on the physical switch? Check that it is a momentary spring switch on the SW input, not an ordinary toggle. A toggle cannot produce the sequence.
  • Pairing fails? Move the two devices closer. Thick walls and large metal surfaces cut the range sharply.
  • The BLU buttons still appear in the app. Direct pairing does not remove them — the remaining buttons stay available for cloud automations, so one switch can do both.
  • Changing the ON button? Repeat the pairing. The previous assignment is replaced; there is nothing to unpair first.
  • Pair several switches to one light. A dimmer accepts more than one remote, which is how you get two-way switching with no wire between the two positions.

Video tutorial

A full walkthrough covering the switch, the dimmer settings and both pairing methods.

Loads YouTube when you press play. Watch on YouTube

By ShellyGuide on YouTube

This video is in Danish. Auto-translated subtitles are available in the YouTube player settings.

Two short clips showing each method on its own:

Loads YouTube when you press play. Watch on YouTube

By ShellyGuide on YouTube

Loads YouTube when you press play. Watch on YouTube

By ShellyGuide on YouTube

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