Thinklabs One is not a Bluetooth-enabled device; there is no built-in Bluetooth. The reason for this is because the Bluetooth signal tends to truncate the low frequencies of the human body's sounds which are critical to auscultation. We also find that the unreliability of Bluetooth - like problems with pairing and dropped signals - is especially challenging in a clinical setting.
However, a small external transmitter can be readily used with the Thinklabs One by connecting the stethoscope to an external Bluetooth transmitter. The Bluetooth transmitter can then be paired with Bluetooth devices like wireless headphones or speakers. (Please note that the transmitter cannot be paired with smartphones or tablets, only with listening devices such as headphones and loudspeakers.)
We have tested and we recommend the TaoTronics Bluetooth 4.1 Transmitter and Receiver and the Hagibis Bluetooth X2 5.0 Transmitter Receiver.
You can purchase the TaoTronics Bluetooth 5.0 Transmitter and Receiver here.
You can purchase the Hagibis Bluetooth X2 Transmitter and Receiver here.