The applications for this proximity device are limited only by your imagination. This "announcer" blurts out your 6 second pre-recorded message whenever a person approaches it. Detects movement up to 20' away. Useful as a warning for the visually impaired. Use for greeting, promotional, marketing, warning, direction, or help messages. Use to train or scare away animals. Supplied with a mounting bracket that allows 120 degree swivel adjusment. For portable use, it is powered with (4) AA batteries (not included) For permanent installation, use a 6VDC/600MA regulated wall transformer (not included). ME508