9 V alkaline batteries produce a constant high voltage output throughout their entire lifetime. This means the fence device also emits a constant output during this time. free from mercury and cadmium Product basic info Primary colours: Black Depth unit: 11 cm Height unit: 15 cm Width unit: 16.5 cm Weight unit: 2350 g Technical data Battery capacity: 120 mAh Power supply Output voltage rating: 9 V Battery composition: Alkaline (EN)