Bluetooth® Technology Lets You Transmit Sounds Real-Time to Your PC. Proprietary Ambient Noise Reduction Technology reduces on average 85% of unwanted background noise. Capture a sound for later playback with 12 recording tracks. M button starts up Bluetooth technology to wirelessly transmit heart and lung sounds to your PC for further analysis or transfer to patient records. Up to 24x sound amplification. Power on/off, bell/diaphragm/extended range frequency, and and buttons to adjust sound level up or down. LCD Interface advises you of current sound level, and.