Now just £40.99 rrp £54.95 SAVE £15!One of the best and most effective Fox deterrent devices available to the Market. 125 square metre 1,350 sq.ft. coverage and inaudible to humans. Harmless to foxes and can be powered by a 9 volt battery or a mains adaptor for increased performance. Average Battery life 2 3 months however mains adaptor recommended if a lot of people or creatures pass by as the alarm volume is increased by 30%.