This is a set of modules that can receive information over RF; this data is transmitted from a base transmitter which is connected to Bluetooth module that can receive data from your phone. Essentially this converts the input from the phone to RF signals that can be transmitted over a short distance to control various components.
This picture here shows the transmitter module and the receiver module. The transmitter consists of an ATTiny85, Bluetooth Module, and a TX RF module. The Receiver has only the ATTiny85, and a RX RF module. The transmitter is designed to be a central unit where the information is taken from the user via Bluetooth and is then relayed to the receivers over RF. Having a central transmitter allows us to have as many receivers as we want without the signal being affected in any way. These RF links are not so powerful, I was able to get about 31FT of transmission from the Central transmitter to the Receiver station I made. This Receiver station can be seen on the picture below. Here I have two sets of receiver modules being powered by the same 3.7 LI-PO battery. I have the LED’s on these modules turn ON/OFF, 0 turns one off, but turns on the other, etc. This allowed me to test on having more than one receiver module.