Bluetooth Receiver Transmitter Adapter for Home Audio Music Streaming Sound System /Bluetooth Car Kits with 3.5 Mm Stereo Output Cable Works with most speakers, television,cellphone and radio: Plugs into any powered PC speakers, home stereo systems and A/V receivers using RCA or 3.5 mm jacks. This product not only is a receiver, but also a transmitter. Bluetooth Audio Adapter: Makes your speakers Bluetooth for streaming music from your smart phone or tablet Music or call switching, free and relaxed. Super clear and flow conversation effect. Simple and Easy Wireless Set-Up, Automatically connect, if you need the cell phone connect the receiver automatically, just turn on the Bluetooth of the cell phone first, and then turn on the Bluetooth receiver Simple one-button switch to shift between transmitter(TX) and receiver(RX) mode.