I am pretty sure the original “Square-style” Sengled Outlets are NOT Zigbee repeaters.
I have been very pleased with my older Centralite Zigbee outlets, which do work well as repeaters. However, the old models are no longer available. Here are the current Centralite Zigbee outlets. I am not sure if they are considered 'good' repeaters or not. I bought a few for my parent's house, but I have not yet installed them...
