The Sony TCM-150 Cassette Recorder is a one button mono recorder for quick play/record operations. It runs on two AA batteries that run for up to twenty five hours. Its LED battery indicator shows battery life. It has voice recording, cue and review, pause switch, stop/pause release functions, a built in microphone and automatic shut-off. It weights only 6 ounces. For only $25, this is about the cheapest cassette recorder one can find. This device is intended for lectures, note taking and interviews.