How to use an old amplifier speaker without Bluetooth to play music of a phone?DS700 easily do it.

1Mii DS700 Bluetooth Transmitter & Receiver, how to use RCA cable connect 1 phone to amplifier speaker without Bluetooth function?1Mii DS700 Bluetooth audio transceiver RX mode helps you easily achieve.
1Mii HiFi Bluetooth 5.0 Music Transmitter Receiver 2-in-1, Long Range Bluetooth Adapter with LDAC, aptX HD, OLED Display & RCA Optical Output for/PC/TV/Speaker/Amplifier/Home Stereo -DS700 transceiver
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