ENJOY WIRELESS MUSIC: The bluetooth audio receiver connects to powered speaker, home stereo systems or other speaker systems via an audio cable (3.5mm/RCA), then pairs with Bluetooth audio devices such as smartphones,computers or tablets for streaming music.Turn ordinary sound systems into Bluetooth-enabled devices and enjoy a musical feast.ADVANCED ARRAY OF AUDIO TECHNOLOGIES: This Bluetooth audio adapter adopts a low-power Bluetooth audio SoC, designed for use in mainstream Bluetooth speakers. Includes support for Qualcomm aptX Audio and aptX HD audio technology, designed to deliver consistent, high-quality audio streaming over Bluetooth.LONG RANGE: The Bluetooth adapter has a built-in Bluetooth antenna signal gain amplifier,and the connection distance indoors (without obstacles) is 80 to 100feet.NOTE: The bluetooth adapter is a bluetooth audio receiver only,not a bluetooth transmitter.Only to give Bluetooth capabilities to active speakers, old home stereo systems, and AV receivers.This rca bluetooth adapter doesn't have a built-in battery and is powered by an AC adapter or USB cable.EXCELLENT CUSTOMER SUPPORT: We give a two-year service for our bluetooth receiver for speakers. Whenever you need help with bluetooth adapter for old stereo, you can come to us for timely support and fast replacement. Please contact us first if you have any problems about the bluetooth adapter.INTELLIGENT ONE-TO-TWO: The Bluetooth adapter for stereo receiver supports simultaneous connection to two phones or tablets, allowing for effortless music switching. but only one phone's audio can be played at a time.EASY TO SETUP: It will automatically enter pairing mode after being powered on,Once successfully connected,It can automatically reconnect with previously paired devices. Press and hold the Bluetooth button for 2 seconds to enter pairing mode, making it easy to connect to a new device.