Receiver to Bluetooth Transmitter Help

[C McCarter]

Hello, I am looking to connect my receiver (Oykno SR-313) to a Class 1 Bluetooth transmitter for audio but am having trouble finding a class one transmitter that accepts audio cables. Typically I only find 3.5 mm inputs or the odd time RCA. I am only using this to transmit music to an outdoor speaker (bluetooth only). I currently have it transmitting from my HTPC but want to have music indoors and outdoors at the same time from my stereo system, which I cannot do easily on my PC. Does anyone know of a good transmitter (class 1, range ~100m) that accepts audio cable input or a good transmitter that uses RCA? Thanks.