This walkman sized recorder can be plugged directly into a telephone socket enabling you to make perfect recordings of all incoming and outgoing calls. Whenever a call is made or received the unit will switch on automatically and record both sides of the conversation. Automatic switching ensures there is no tape wastage and gives up to 6 hours recording (3 hours per side). The telephone recorder is parallel connected, recording every extension on the line, not just the one it is connected to.