The Sandberg Bluetooth Audio Link 2in1 TxRx allows for wireless sound signal transmission and reception via Bluetooth. In transmitter (Tx) mode, it can send audio from devices like TVs to Bluetooth headsets. In receiver (Rx) mode, it connects Bluetooth devices such as smartphones to AUX inputs (e.g., in car stereos) for wireless music playback. This device features a 2-in-1 Bluetooth receiver and transmitter, enabling connection of Bluetooth headsets to TVs or smartphones to AUX inputs. It supports wireless music reception for car and home audio systems. The adapter supports Bluetooth 5.1 and is rechargeable. It can be powered via USB-C for continuous use. The built-in Li-on battery has a 250mAh capacity, providing 2-3 hours of playtime on a single charge. Specifications include dimensions of H:1.2 x W:2.9 x D:5.5 cm and a 60-month guarantee. The model number is 450-12.