Pairing two Teufel Bluetooth devices is possible with some models (see below). In the respective user manual, this option can be found under "Connect mode".
Rockster Go: can be paired with another GO or a ROCKSTER CROSS.
ROCKSTER CROSS: can be paired with another CROSS or a ROCKSTER CROSS
BOOMSTER: supports the function with which the sound can be played back simultaneously from two BOOMSTER speakers. Applies only to the current BOOMSTER (not BOOMSTER 2020).
ROCKSTER XS*: can be paired with an identical ROCKSTER XS - true stereo function
*Note that two ROCKSTER XS from different series cannot be paired with each other.