The 3MT LittmannR Electronic Stethoscope Model 3200 combines Ambient Noise Reduction technology and frictional noise dampening features with amplification, BluetoothR technology, and an all-new user interface, for the next level of performance and ease of use. Benefits .Record and save up to twelve 30-second patient sound tracks .Transmit sounds via BluetoothR technology (BluetoothR adaptor included - not compatible with Apple devices) .Listen remotely via 3MT LittmannR TeleStethT System (sold separately) .Eliminate 85% (on average) of ambient noise .Amplify sounds up to 24x