DS500 is an audiophile quality premium HiFi Bluetooth audio adapter that adds high definition Bluetooth connectivity to any vintage home stereo, AV receiver or powered speakers. DS500 Bluetooth receiver features Qualcomm QCC5125 Bluetooth chip and ES9018K2M chip, delivering stable Bluetooth connection and a performance level that will satisfy the most demanding audio enthusiasts. Featuring support for the state-of-the-art Sony LDAC audio codec, Qualcomm aptX HD, aptX Low Latency, aptX and AAC decoding, DS500 adds the highest quality Bluetooth audio to any home stereo system. With analog RCA, digital optical and digital coaxial outputs, the DS500 is perfectly compatible with all types of audio systems for true high-resolution audio. with an external booster antenna to extend the wireless range to over 30m/100ft for a stable wireless connection. Press /- the button to adjust the volume. In Bluetooth connection mode, support EQ mode. With the EQ mode, you can set the music style as you like. PACKAGE: DS500 Bluetooth receiver x 1 3.5mm to 2 RCA splitter cable x 1 2RCA to 2RCA stereo audio cable x 1 Optical audio cable x 1 USB cable x 1 Charger x 1 User manual x 1 Q&A: 1. Q: How do I enter the EQ mode to adjust the equalizer? A: Play music state, long press the five switches (the rightmost button) 2S to enter EQ-MODE, left and right keys to switch POP/ROCK/JAZZ/BASS/NORM to get a variety of sound experience. Note: boot default NORM. 2. Q: How are the USB input audio files controlled? A: If you plug the USB cable, this DS500 HiFi Bluetooth receiver will switch to the USB mode, and if you unplug the USB cable, it will switch to the Bluetooth mode. 3. Q: Why do I have sound problem when connecting DS500 by optical output? A: If your device does not support 96K sample rate, switch LDAC off, this usually solves your sound problem. (Find DS500 in the Bluetooth list of your phone – Click DS500 to open the drop-down list – Switch LDAC to off) 1Mii DS500 Bluetooth 5.1 receiver Audiophile quality digital sound Brilliant wireless audio Versatile & stable connectivity Volume control & EQ mode High quality Bluetooth codecs Hi-Res LDAC Upgrade your home stereo