I actually had no idea what this was or what it did when it was offered as a review. NOW? Now I can’t image not having it! So what is it? Well; this little guy lets me broadcast an audio signal to two different devices at once. I don’t sleep well at night and I don’t want to disturb The Husband this little guy lets me use my headset without any cords! HOWEVER!!! MY favorite way to use the DoublePlay?? I have a ton of music files on my laptop. My laptop puts out terrible sound. I have a fantastic set of Bluetooth speakers and using the DoublePlay I have the BEST of both worlds!! MY music with excellent sound at the touch of a button! In the package is the Transmitter; it has only one button; the PAIRING button. My first experiment, I plugged the male/male 3.5 audio jack into my audio device, in this case my laptop. Since there is no internal battery you do have to plug this in with the USB cord to operate. I plugged it into my laptop; but a USB wall charger works equally as well. Push the pairing button and bam! My…