ESPboy Sub1Ghz Inspector CC1101 module uses powerful CC1101 transceiver to listen, record, and replay the radio signals range 300-348 MHZ, 387-464MHZ, and 779-928MHZ.
This allows you to copy and clone the radio signals sent out and received by the most popular low-cost power outlet sockets and light switches.

Do not use it for copying the garage doors, gates, and barriers control signals, it's against the law and private property.

Source code