Features: This RF Bridge can convert most of the 433MHz RF Remote Controls to WiFi Wireless. Making your 433MHz RF controlled appliances smarter. It can be used for most of the 433MHz RF Remote controlled products, like RF controlled switch, RF controlled socket, RF controlled bulb, RF controlled door opener, etc. Works perfectly for Amazon for Alexa,You can directly ask for Amazon for Echo/for Echo Dot/for Amazon Tap to control it. Support set timers to open/close device at a fixed time. After adding the RF wireless Bridge for iOS/for Android App for eWeLink , you can add up to 4pc 1-4 buttons 433MHz (4 pcs 433MHz controls not allowed exceed total 16 buttons) Wireless RF Remotes to the RF Bridge device. And Control 433MHz RF devices on the App through WiFi/2/3/4G network. Even more exciting is that it will work with door magnetic sensor, human body IR sensor, and more other sensors to realize security alarm, and allowing you to DIY smart scenes. This model supports for Amazon for Alexa and for Google Home voice control. Descriptions: Sonoff RF Bridge Universal Remote Control is a compact and easy-to-use device that allows you to monitor and control your home's electronic devices from anywhere. Support most of home appliances,Volume gate, TV, TV Box, Air-conditioning, Loudspeaker Box, Motor Curtain, wall switch light, etc. No matter IR remote, or RF remote, only one smart phone can control everything. Specification: Brand: Sonoff Material: ABS Size: 62*62*20mm Supports fixed code 433 frequency: PT2260, PT2262, PT2264, EV1527, etc. Not support to learn rolling code and dynamic code Wireless Standard: WiFi 2.4GHz Supported Radio: 433MHz RF Power Supply: USB 5V Package included: 1 x RF Bridge 433 Notes: Please allow 0-2mm error due to manual measurement, thanks for understanding. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you!