Product features: stop tape recorder and digital cassette recorder combination of clock remote control, long operation to 3 hours, and weight size of intelligent battery suits to carry.

Along with the rapid development of science and technology, the original recording tape has been changed into digital recording. The recording quality of digital recorder can be changed according to need; recording time can last for hundreds of hours. There are many digital recording products for example: MP3, MP4, mobile, recording watch etc, the rapid development of the recording will also bring hidden trouble to the protection of state secrets and personal privacy military secrets, someone who have ulterior motives violate regulations record secretly everywhere. The eavesdropper record state or military secrets confidentially, commercial spy stolen information by recording business technology, Private detective and lawyers use the secret recording as  the court evidence, News media reporters use the secret recording as reporting according, Individuals use it to infringe upon their privacy.