Color: white, The BTR 55 MK2 is a flush-mounted stereo Bluetooth receiver (standard A2DP, pairing) for connecting Bluetooth-enabled devices (e.g. mobile phones, tablet PCs, etc.) as a music source for in-house transmission. The transmission range of the audio signal is 10m. The power supply is via a 230V connection. The front panel of the BTR 55 MK2 is 55 x 55 mm and fits into many common switch programs.