I ordered the bundle with 2 receivers and 1 transmitter and was very excited to use them for an upcoming gig. I used stereo cabled system before and was very disappointed when I heard the sound in MONO!
I am very upset that this isn't written in the description of the device and have therefore returned it.
The device itself is very easy to use and super compact so it's great for beginners, but having everything in mono takes away the "life" of the live aspect and is even more isolating with the in-ears.