Product Description Great for connecting Bluetooth enabled devicesSupports multiple versions of Windows including Windows XP, Vista, Win7, Win8, Win10Easy to use with Plug and Play capabilityBackward compatible with Bluetooth 2.0, 2.1, 3.0 and 4.0.5.0 specificationsTransmitter Mode (TX) Red light: transfer audio from non Bluetooth device (tv, stereo, etc) to your Bluetooth headphones or speakersReceiver Mode (RX) Blue light: transfer audio from your Bluetooth device (headphones, speakers, etc) to your non Bluetooth device Whats included in the package 1x Bluetooth 5.0 Audio Receiver Adapter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.