Connect SONOFF ZigBee Devices to Alexa Echo 4

SONOFF - Zigbee 3.0 connected micro switch module

SONOFF S31 Lite 15A Zigbee Smart Plug ETL Certified

SONOFF_Global

Interact with your devices via ZigBee Protocol:A compatible ZigBee hub is required to control this plug. Pair your plug to a compatible ZigBee hub

SONOFF S40 Lite 15A Zigbee Smart Plug with ETL Certified, Works with SmartThings, and Echo Plus, Hub Needed for Alexa 4-Pack

Sonoff ZBMINI-L 1 Gang Zigbee Smart Switch, No Neutral Wire Required, 2 Way Control App/Voice, Single/Countdown Timing, Zigbee Hubs Support, Alexa,SmartThings/PC V0, White

Works with Alexa Instruction Guide - SONOFF Official

Sonoff ZB Bridge-Pro - (Manage Up to 128 Zigbee Devices) - GeeWiz

How to hook up your Zigbee smart home devices to the Echo

How To Bridge Zigbee With Home Assistant - SmartHomeScene