The Martin Yale Handheld Electric Letter Opener PRE1624 is a safe and compact tool designed for easy envelope opening at home or in the office. Its lightweight and portable design makes it convenient for use in a briefcase. Featuring fully enclosed rotary blades, this letter opener prevents accidental injury while trimming envelopes neatly without ripping or tearing contents. The ergonomic design conforms to your hand, and it automatically activates when envelopes are inserted. The letter opener operates on four AA batteries, which are sold separately.