Smart WiFi 3 Way Switch
MSS550HK / MSS550 US
  • Replace one dumb 3 way switch to make the whole system smart.
  • Turn lights on/off from anywhere anytime with Meross app.
  • Works with Amazon Alexa, Apple HomeKit*, Google Assistant, and SmartThings.
  • Create on/off schedules or auto-off timers to work automatically.
  • LED indicator helps find the switch easily, even at night.
  • Works with the WiFi you already have. No hub required.
  • Neutral wire(white wire) required. Works with 2.4GHz only.



* Only MSS550HK supports HomeKit, MSS550 does NOT support HomeKit.






                                   Hardware Features



90-125V~, 50/60Hz


90-125V~, 50/60Hz

200W max. for INC

150W max. for CFL&LED


1 x On/Off button

Press and hold for 5 seconds to initiate factory reset process


1 x Status LED

Dimensions ( W x D x H )

4.1 x 1.8 x 1.4 in. (without faceplate)
4.7 x 2.8 x 1.4 in. (with faceplate)


One internal antenna


                                   Wireless Features


Wireless Standards

IEEE 802.11 b/g/n, 2.4GHz, 1T1R

Wireless Security

Support 64/128 bit WEP, WPA-PSK/WPA2-PSK
*Does not support Enterprise Wi-Fi.






Package Contents

1 x Smart Wi-Fi 3 way wall switch

1 x User manual

System Requirements

Smartphone running iOS 9* or higher, Android 4.1 or higher
Existing Wi-Fi network

*HomeKit version requires iOS 13.0 or higher.


Operating Temperature: 0°C~40°C (32°F~104°F)

Storage Temperature: -40°C~70°C (-40°F~158°F)

Operating Humidity: 10%~90% non-condensing

Storage Humidity: 5%~90% non-condensing




                                                  1. How many smart home devices can the Meross app control?

                                                  2. Can my Meross smart home devices be controlled by multiple phones?

                                                  3Do Meross smart home devices retain the selected settings if it encounters a power outage?

                                                  4Will the Schedule and Auto off feature still take effect if the Internet is down?

                                                  6What should I do if my smart home device time doesn't match the real time?

                                                  7How do I control Smart Devices by Amazon Echo/Dot/Tap with voice commands?

                                                  8How do I connect my Meross devices to Amazon Alexa?

                                                  9Why I didn't find my device on "Select a Device Page" in Meross app?

                                                  10Do my Meross smart devices support Campus, Hotel, Airport or Shopping Mall WiFi Hotspots?

                                                  11How do I connect my Meross devices to Google Assistant?

                                                  13After been successfully used for a while, my Amazon Alexa or Google Assistant is unable to control Meross devices.

                                                  14How to make my Meross devices work with IFTTT?

                                                  15. Do Meross devices work with my Fritz!Box?

                                                  29. What should I do when my Meross app is unable to control the added wall switch?

                                                  39. Installation tips for MSS550 v2.

                                                  41. How to make my Meross devices work with SmartThings app?