The Olympus VN-541 PC + TP-8 is a voice recorder with noise reduction and an external telephone microphone. Thanks to the noise reduction, your recording is not affected by disturbing ambient sounds, such as wind. This is useful if you often go outside to make recordings. With the included TP-8 telephony microphone you register telephone conversations on your voice recorder. When you make a call, the TP-8 records both sides of the conversation on the VN-541 PC. The recorder has an internal memory of 4 GB. That is equivalent to about 1570 hours of noise.