A powerful ultrasonic repeller designed to clear the garden of unwanted visitors. The motion detector detects movement up to 70 ft. from the unit, which triggers a burst of powerful ultrasound, harmlessly scaring the intruder away. Simple 3-position settings let you target small, medium or large-sized garden intruders. Battery operated (4 x D cell batteries), with option to run off a 12v AC/DC adapter (sold separately). Batteries will normally last around 3 months. A passive Infra-red (PIR) sensor detects movement in an arc, max. 70 x 50ft. Includes wall/fence mounting adapter, and rod adapter for placing on a pole, allowing a total flexibility of location for maximum effectiveness. Test button triggers an audible signal. Safe and effective - no chemicals or traps. Will not affect people, fish or birds.