The telephone recorder automatically records all calls made on direct business/home landline phones. You can set it to automatically record anytime a call is made or received by line voltage or sound activation. Recordings are stored on 8GB-32GB removable SD card (8GB included). Calls can be played back on itself or you can remove the SD card and playback/store the recordings on any MAC or Windows computer; no extra software is needed. visit us https://www.euspyshop.com/prod....uct/telephone-record