You can use Bluetooth Transmitter to connect to the audio output of your non-Bluetooth devices such as TV, iPod, PC, then pair it with your Bluetooth stereo like headphones or speakers, then the audio would be transmitted to your stereo..
You can connect Bluetooth Receiver to the traditional devices like wired headphones or speakers, then pair it with your phone or tablet, so you will enjoy great music with Bluetooth wireless connection.
The working ranges of our Bluetooth adapters provided on the product detail pages on Amazon, are all based on our test results in an open space. As the performance of Bluetooth adapters, it depends upon a lot of factors - Bluetooth transmitter/receiver (Bluetooth headphone/speaker), electrical / WiFi interferences, living environment (brick walls are enemies to any magnetic waves) etc. Therefore, the actual range might be shorted due to barriers like walls or floors.