totally conquered by this. installed for one week there is no longer a cat in my garden! finished droppings in my driveway. no need to look after it recharges the battery alone. pity the manual is in English but the use is simple. -range set to max, and has power 3. attention from level 4 on falsh fires automatically. no way to be at level 4 and 5 without the flash. but with the level 3 I have more cat fits me so! Ultrasound very powerful, at ca 5 pierces the ears anyway !!!! remains to be seen if he holds over the life outside in the rain and cold! in any case in the spring I ordered a 2nd for the back garden!