This product is a version with a 433MHz RF receiver module inside. It can be paired with the RF remote controller, which enables you to control your appliances indoors.
Sonoff S26 is a WiFi smart plug with EU/US/UK/CN/AU/IT/IL/BR/CH standard. Users can instantly convert any plug into a smart outlet with a convenient timer function that works on user's smartphone.
SONOFF S55 is a handy Waterproof Smart Socket that can connect to your home Wi-Fi network and make you manage and program devices from far with your phone or voice via Amazon Alexa or Google Assistant.