Short answer: The Somfy Zigbee wall switch for two zones is the DecoFlex WireFree Zigbee 2 Channel In-wall, White (1871573). It runs on two AAA batteries, talks Zigbee at 2.450 GHz, and gives each channel one Zigbee shade or one group, plus a MY button for a favorite position. Somfy lists the TaHoma switch as its companion hub.
A Zigbee shade job needs a control at the door, and a handheld remote rarely stays there. The Somfy DecoFlex WireFree Zigbee 2 Channel In-wall, White (1871573) fills that spot with two channels in a decorator-style body that lines up beside a light switch. Installers spec it for a bedroom with a blackout layer and a sheer layer, or a living room with one window bank and one patio door.
Two channels cover more rooms than the count suggests. Somfy rates each channel for one individual product or one group of motorized Zigbee products, so channel 1 can run a single shade while channel 2 runs four shades as a set.
Two zones on one Zigbee wall switch
The switch carries Up, Down and a MY button, and Somfy uses MY to recall a saved favorite position. A bedroom owner can stop the blackout shade at a set height each morning with one press. One button does it.
Somfy lists five application groups for 1871573: awnings, exterior solar screens, interior blinds, draperies and shades, pergolas, and rolling shutters. The radio matters more than the shade type. If the motor or device speaks Somfy Zigbee, the DecoFlex can address it. Somfy also states the switch operates Zigbee Smart Plugs, so a lamp on a plug can share the wall plate with the shades.
The RTS DecoFlex switches look close to identical on a wall, and they do not swap with this one. An RTS motor listens on 433.420 MHz and ignores a Zigbee keypad. Check the Somfy name on the motor for "Zigbee" before ordering.
Somfy-verified specs for 1871573
| Somfy name | DecoFlex WireFree Zigbee 2 Channel In-wall, White |
| Reference | 1871573 |
| Channels | 2, each for one product or one group |
| Radio | Zigbee, 2.450 GHz |
| Power | 2 x LR3 (AAA) batteries, 1.5 V each, 3 V minimum |
| Dimensions | 4.5 in long x 2.75 in wide x 0.54 in high |
| Operating temperature | 32 to 140 F |
| Protection index | IP 20 |
| Approvals | FCC, UL |
| Finish | White (Pure) |
| Companion hub | TaHoma switch (1871037), TaHoma switch with Ethernet adaptor (1871038) |
| Applications | Awnings, exterior solar screens, interior blinds, draperies and shades, pergolas, rolling shutters |
| Warranty | 5 years |
IP 20 marks this as an interior control. For an awning or pergola, mount the switch on the inside wall next to the door that leads out, and keep it out of rain and spray.
Zigbee motors and devices it controls
The DecoFlex Zigbee pairs with the Zigbee side of the Somfy range, battery or wired. Two rechargeable roller shade motors cover most residential jobs:
- The Somfy Sonesse 40 WireFree Zigbee Li-ion USB-C Motor (1245993), a rechargeable motor for larger roller shades with no wire to the wall. A battery switch on a battery motor keeps the whole window free of line voltage.
- The Somfy Sonesse 28 WireFree Zigbee Li-ion Motor (1241755) for smaller shades and tight headrails.
On jobs where power runs to the window, wired Sonesse 40 Zigbee motors and Glydea ULTRA drapery motors fitted for Zigbee answer the same keypad.
A wired motor with no radio will not respond to this switch. That motor needs a dry-contact switch station or a receiver first. For the full picture of what a Zigbee job needs, read our guide to Somfy Zigbee and what you need to run it.
TaHoma and the Zigbee setup path
Somfy names the Somfy TaHoma Switch RTS and Zigbee Smart Hub (1871037) as the device this keypad works with. TaHoma brings the switch, the motors and any Smart Plugs into one app, where the owner builds scenes and adds voice control. TaHoma speaks RTS as well, so a house with older RTS shades and new Zigbee shades still runs from one app.
For a home office or a media rack where Wi-Fi struggles, the Somfy TaHoma Switch with Ethernet Adaptor (1871038) puts the hub on a wired network connection. Somfy lists both versions as compatible with 1871573.
Somfy publishes the pairing sequence for this keypad in its DecoFlex WireFree Zigbee instructions, posted with the spec sheet on the 1871573 product page at somfysystems.com. Follow that document for the button presses. Steps on Zigbee motors can differ by motor generation, so keep the motor's install guide from our Somfy spec library at hand during setup. Our TaHoma switch setup guide covers the hub side.
Mounting, batteries and buttons
The 1871573 is the in-wall body. Somfy builds the same 2 channel keypad as a surface-mount version, the Somfy DecoFlex WireFree Zigbee 2 Channel Surface-mount, White (1871577), which sits on the wall face. Pick in-wall for a flush look beside existing decorator switches. Pick surface-mount for tile or a rental where cutting the wall is off the table.
Power comes from two LR3 (AAA) cells at 1.5 V each, and Somfy sets 3 V as the minimum voltage. Nothing connects to line voltage, so the keypad needs no electrician for power. Keep a pair of fresh AAA cells with the shade paperwork. Somfy rates the working range at 32 to 140 F, which suits any conditioned room.
Replacement and engraved buttons come from Somfy under their own references: 1871604 for the 2 channel top button and 1871605 for the 2 channel bottom button. Somfy also posts a DecoFlex Zigbee engraving form for households that want "Bedroom" or "Patio" printed on the buttons.
In-wall 2 channel or another DecoFlex Zigbee
Count the zones at the door, then add one for a whole-room group if the owner wants it. Two zones, or one zone plus a group button, fit 1871573. Three or four zones call for the DecoFlex WireFree Zigbee 4 Channel in-wall (1871572) or its surface-mount twin (1871576). A second 2 channel keypad at a second door works too, since a channel only needs to be paired to the shades it runs.
Our DecoFlex wall switch comparison lays out each RTS, Zigbee and SDN model side by side, and the full range sits in our Somfy DecoFlex wall switches collection. For a Zigbee room with two zones, the in-wall DecoFlex WireFree Zigbee 2 Channel (1871573) is the part to order, and a TaHoma switch is the natural next add.
Sources: somfysystems.com and somfypro.com product pages for 1871573 and 1871577.
FAQ
Does the Somfy DecoFlex Zigbee switch work with RTS motors?
No. The 1871573 transmits Zigbee at 2.450 GHz, and Somfy RTS motors listen on 433.420 MHz. Pair it with Somfy Zigbee motors and Zigbee Smart Plugs. For RTS shades, Somfy makes DecoFlex WireFree RTS switches in the same decorator style. A TaHoma switch speaks both radios and can run a mixed house from one app.
Which batteries does the DecoFlex WireFree Zigbee 2 channel use?
Somfy specifies two LR3 (AAA) batteries at 1.5 V each, with 3 V as the minimum voltage for the keypad. Standard alkaline AAA cells match that rating. The keypad needs no wiring to line voltage, so a battery change is the only routine service. Keep spare cells with the shade paperwork for the homeowner.
Can one channel run several Zigbee shades at once?
Yes. Somfy rates each channel for one individual product or one group of motorized Zigbee products. Put three shades in a group on channel 1 and they move together on one press, while channel 2 runs a single shade or a second group. The MY button recalls the favorite position Somfy saves for the shade or group.
Do I need a TaHoma switch with the DecoFlex Zigbee keypad?
Somfy lists the TaHoma switch (1871037) and the TaHoma switch with Ethernet adaptor (1871038) as the compatible devices for 1871573. TaHoma adds app control, scenes, schedules and voice assistants on top of the wall buttons. For the pairing sequence, follow Somfy's DecoFlex WireFree Zigbee instructions on the 1871573 product page at somfysystems.com.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
